Fix Samsung Galaxy S21 Ultra 5G SM-G9980/B/N/U/U1/W Stuck on Boot Start screen logo

We should know that our Smartphones are similar to handling handheld PCs, and the software and hardware should both work accordingly to give better performance. So, Our mobile can be affected by software problems, and the issues can happen while handling heavy apps or massive updates. Samsung Galaxy S21 Ultra 5G is a flagship mobile with high-end specs, and it can run any apps or updates without any issues. But when you try to root your mobile or modify the firmware files, it may get stuck on the boot logo after flashing custom files. When your Samsung Galaxy S21 Ultra 5G is stuck on the boot logo, you can fix your mobile using one of the below methods.

What is the Stuck in the Boot logo in Samsung Galaxy S21 Ultra 5G (SM-G9980, SM-G998B, SM-G998N, SM-G998U, SM-G998U1, SM-G998W)?

OTA updates are, most of the time, flawless processes. But when the mobile begins to finish the first boot after the update, It is a nail-biting situation for most users. Because sometimes the boot can take a long time than usual. If the boot happens after a long time, it is excellent. But it is not a good sign when the boot takes more than 20 minutes and is stuck on the Samsung Galaxy S21 Ultra 5G name logo. You can wait for a few minutes. Even after your mobile is not booted into the regular screen, your mobile is stuck on the Samsung Boot logo. You don’t need to worry. We can start with simple methods to fix these issues. Always start with a simple process. Most of the time, the boot stuck fixed in simple ways.

Boot logo stuck can happen for various reasons and different situations. When you restart the mobile after the monthly security patch updates or major upgrades like Android 11, 12, It can happen. Due to Overwrite already existing codes in the OS and the process doesn’t go as expected, We have to deal with this kind of problem. When you face this issue, Don’t rush for firmware flash, You will lose user data. The Firmware flash should be your last choice, and We can recover your mobile using different methods. The stuck can happen in two screens- The Samsung Logo and The Mobile details screen logo. For both screens, the following techniques will work.

How to Fix Samsung Galaxy S21 Ultra 5G Stuck on Boot logo (SM-G9980, SM-G998B, SM-G998N, SM-G998U, SM-G998U1, SM-G998W)?

When you give more time than usual, and your mobile won’t boot into System OS, you can follow the below methods to fix your stuck Samsung Galaxy S21 Ultra 5G on the Boot logo. Our motto is as much as we can retrieve your mobile without losing data. But when we can’t, we have to flash the full firmware to get your mobile back.

1. Long Press Power Button

Even if it is a simple method, and you may wonder what technology can help here. Most of the time, all electronic devices will work after the power is off and on, and it will work most of the time. Long press your power button for 10 seconds, It will trigger your mobile’s power, and your mobile will shut down in a few seconds.

2. Boot into Safe Mode

Sometimes third-party apps may trigger the new version, and it may cause the stuck-in boot logo. Try to boot into Safe Mode by pressing Volume Down for 10-15 seconds. Your mobile will boot into Safe mode. Try to Un-Install the recently installed app before the OTA process. Also, check the compatibility in Play Store. When you install apps other than Play Store, Un-Install them and try to boot again.

3. Reboot using recovery

This method will not affect your User data. It will only soft reset your mobile. You have to press Volume Up+ Volume Down+ Power Button on your mobile for 7-10 Seconds to boot into recovery mode. After that, it will boot you into the recovery mode or directly boot into System OS. The response may vary depending on the mobile manufacturers. If you received a Recovery mode menu, use the Volume keys to navigate and the Power button to confirm the selection.

3.1 Stock Recovery method

If you didn’t use Rooted mobiles, you have Stock Recovery, provided by your official mobile manufacturer. If you have stock recovery, you have the direct option as “Reboot System Now.” Navigate to this option and confirm it using the power key button.

3.2 TWRP Recovery method

When you use Rooted mobiles, you either use Stock Recovery or TWRP custom recovery. If you have Stock Recovery, you can use the above process. When you install TWRP on your mobile, follow the steps below.

• The Keycombinations will boot your mobile into TWRP Recovery mode.

• On the Home screen, you can find the option “Boot.” Select the item; you will receive further options as System, Power Off, Recovery, and Bootloader. Select “System.” Your mobile will boot into Normal OS.

4. Using ADB Commands to Reboot, your boot logo stuck Samsung Galaxy S21 Ultra 5G Mobile

This process may work 50-60%. If you use Old Mid-range mobiles, the chances are less. But, When you have Flagship mobiles or New mobiles, it will work. The OS can still handle background commands. So, the ADB commands may work.

Steps

• Download the Samsung USB driver and install it on your PC.

• Also, download the ADB drivers. Then, install it on your PC.

• Connect your mobile with a PC.

• Open a command prompt as Administrator and type the below command to check the ADB status.

• adb devices

• It should display the connected devices. If you didn’t get the mobile, restart the command prompt and Disconnect and Connect your mobile. If you are detected, type the below commands.

• adb reboot

• The command will reboot your mobile.

5. Drain Battery Completely

When You can’t Power off or Restart your mobile, Let the battery drain completely. Because with the massive battery, it may take 1-3 days, depending on your mobile battery backup, to remain. When you don’t have this much time and want to urge fix methods, you can proceed with other ways.

6. Wipe Cache Data Partition

When you perform, restart using recovery, and you can’t boot into OS again. In this situation, We have another choice of the fix by Wipe cache partition. It is also will not affect user data. It will wipe only cache data. You have to press Volume Up+ Power Button on your mobile for 7-10 Seconds. After that, it will boot you into the recovery mode or directly boot into System OS. The response may vary depending on the mobile manufacturers. If you received a Recovery mode menu, use the Volume keys to navigate and the Power button to confirm the selection. Remember, you should wipe only the cache partition, Not the Wipe Data/Factory Reset.

6.1 Stock Recovery method

If you didn’t use Rooted mobiles, you have Stock Recovery, provided by your official mobile manufacturer.

• If you have stock recovery, you have the direct option as “Wipe Cache partition.” Navigate to this option and confirm it using the power key button.

• It will ask you to confirm the process. Select “Yes.”

• Most of the time, it will boot into OS after the wipe. When it returns to recovery, Select the Reboot system now.

6.2 TWRP Recovery method

When you use Rooted mobiles, you either use Stock Recovery or TWRP custom recovery. If you have Stock Recovery, you can use the above process. When you install TWRP on your mobile, follow the steps below.

• The Keycombinations will boot your mobile into TWRP Recovery mode.

• On the Home screen, you can find the option “Wipe.” Select the wipe option; you will receive further details. Select “Cache.” Don’t select the System, and it will wipe your OS. After selecting other choices, swipe to erase the data. When the process completes, return to home and boot into OS.

7. Disable Recently installed apps using ADB

If you use Stock Android phones, you can disable/remove the bloatware apps most of the time. If you are in Custom Skin OS, the chances of disabling the Bloatware apps are less. But, We can Disable the Apps using ADB without root. The methods may vary depending on the manufacturer. You have to find the particular Bloatware apps and disable them. I will give the overall idea about ADB steps and commands. But, the list of packages may vary depending on the manufacturers.

• Download the ADB drivers. Install it on your PC.

• Enable USB Debugging Mode and OEM Unlock; you’ll find these options at Settings >>> Developer options. If you didn’t see the developer options on your settings menu, go to about >>> build number. Then, click on the “Build Number” row about ten times regularly to activate your device’s “Developer Option.”

• Connect your mobile with a PC and unlock your mobile (Screen Lock).

• Open a command prompt as Administrator and type the below command to check the ADB status.

• adb devices

• The above command will display some code for device detection. If you didn’t receive any response, Check with the USB Cable. If you get a response, move to the below commands.

• You can disable the apps based on their adb package name. You can find these package names using the below command.

• adb shell pm list packages

• Based on the title, you can exclude unwanted apps. After that, use the am force-stop and pm disables commands with the Application package name.

• You can enter the commands one by one, Or All commands, and Hit Enter. You can get the application package name in Play Store URL. It will start with com.instagram.android like that.

• am force-stop package name(e.g: com.sprint.w.installer)

      pm disable-user package name

• Restart your mobile. Move to different methods when you are stuck on boot logon on your Samsung Galaxy S21 Ultra 5G mobile.

8. Fix firmware using Samsung SmartSwitch

Compared with other manufacturers, Samsung SmartSwitch is an excellent PC suite that can help you in many situations. When you already take backup using SmartSwitch, your Samsung Galaxy S21 Ultra 5G is stuck at the boot logo. We can Flash the firmware using SmartSwitch to back up all the data using the same software. So, The chance for data loss is less. When you don’t have a backup, this method will not help you. You can move differently.

• Download and Install Samsung SmartSwitch Windows/Mac version.

• Install Device Driver from More option in the connect screen.

8.1 Restore mobile Using Emergency Recovery

• Put your Samsung Galaxy S21 Ultra 5G mobile to download mode by pressing Volume Down +Power Button. Then, connect your mobile with your PC using a USB Cable.

• After connecting the mobile with the PC, In More options, Select “Emergency Software Recovery.” When you get the mobile in the list, proceed with the steps. Your stuck boot logo will repair in this process. Move to the below method when you didn’t get the list mobile and have a mobile backup using SmartSwitch.

8.2 When You have SmartSwitch Backup

The backup method will help you when you have backup data using SmartSwitch. Remember, when you don’t have a backup, You will lose your data.

• Put your Samsung Galaxy S21 Ultra 5G mobile to download mode by pressing Volume Down+ Power Button. Then, connect your mobile with your PC using a USB Cable.

• After connecting the mobile with the PC, In More options, Select “Emergency Software Recovery.” Then in another tab, choose “Device Installation.” Finally, type your mobile model number and S/N. We can find the name and value of S/N on mobile phone backside stickers with IMEI or in the retail box.

• It will automatically detect the latest software version and proceed with the update process.

• After the successful update, restart your mobile and set up everything with the same Google Account.

• Now relaunch SmartSwitch and Choose Restore. Allow necessary permissions on your mobile. Finally, select your backup data and restore it to your Samsung Galaxy S21 Ultra 5G mobile.

9. Flash Boot. img file using ODIN and Repair Boot logo stuck Samsung Galaxy S21 Ultra 5G

The main problem of being stuck in the boot logo is with the boot image file. When we flash the particular boot image file, then we can restore your mobile without losing data. But you should know what version of the software is already on the mobile. So you can always go with the latest boot image file. The following method may not work with carrier-locked mobiles like Verizon Wireless.

• Download and install the Samsung USB driver to your computer system.

• Also, download the ODIN software. Select the above Oreo version in the ODIN list. Then, install ODIN on your PC.

• Download Samsung Galaxy S21 Ultra 5G firmware from the below links and save it on your PC. Your Current OS version and Downloaded Version AP and CSC should be the Same.

• Samsung Galaxy S21 Ultra 5G Android 11 Firmware.

9.1 Creating boot.tar file

• Download 7Zip-ZS, LZ4, and Install both on your PC. Extract the files in downloaded firmware using 7Zip-ZS. You will get four files. Click on the AP File and Extract again. You will get some data along with the boot.img.lz4.

• Copy the boot.img.lz4 to LZ4 Installed folder. Convert the lz4 file to a .img file by dragging the .img file to the lz4 application file. You have to drag the file to that application. The script will automatically convert the file to .img format. Again convert this .img file into .tar using 7ZIP. Copy the .tar file to PC.

9.2 Flash boot.tar using ODIN

• Connect your USB cable with your PC. Switch off your device. Then, enter into Download mode. To do this, press and hold Volume Down+ Power Button and Connect Your Mobile To PC via USB Cable; after Samsung Logo Appear, Release all keys.

• Press the Volume Up button to continue when you see the warning message.

• Now, connect the Samsung Galaxy S21 Ultra 5G mobile to the computer via USB cable.

• Launch the Odin app on your computer. If Odin identifies the device, it will show you a message that reads – added!!!

• However, if the device is not connected to the PC correctly, you won’t see this message. So, you have to check the USB cable to see if it is reasonable and reconnect the device.

• After connecting the Samsung device, click on the PDA/PA/AP button to browse/search and get the TWRP from where you saved it on your PC. Also, navigate to “options” and Un-tick the Auto-Reboot.

• Click on “Start”

• Once the file is booted into the device, reboot your device.

10. Flash Complete Firmware using ODIN

We are going full flash firmware in your boot logo stuck Samsung Galaxy S21 Ultra 5G  mobile in this method. It is a Data loss process. So when you don’t have any choice, and none of the above methods don’t work for you, you can use them. Refer- Flash Samsung Galaxy S21 Ultra 5G Firmware using ODIN.

Wrap Up

Even if the software updates process looks simple, 1-5% of people always face OTA updates issues. That’s why we suggest you should always make a backup before making an update on your mobile. Always use cloud photo backup services like Google Photos. Compared with other mobile manufacturers, with the help of Samsung’s available tools, we can fix your Samsung Galaxy S21 Ultra 5G stuck on the boot logo.

If you face freeze and unresponsive issues on your mobile, You should try different methods than the above mentioned. It is always a wise idea to give some time for the first boot after the update. Based on your available storage and apps size, the first boot may take a long time. When you are confident that the mobile is stuck and already given enough time for initialization, you can follow the above steps to fix your mobile. When you try different methods than above and those techniques help you, Comment below. We try to add if those methods work for everyone.

Source, (2), (3)