There can be two causes:

1. Hardware failure. Unlikely, but a possibility.

2. Each device has multiple sub-models, and each sub-model has multiple roms. You need to be sure you're installing the Rom meant for your exact device model, even if you are re-installing a Stock Rom. If you do install a rom not meant for your device, you often face issues like these.

   The solution for this is to first confirm your exact device model:

   • Boot into your device's bootloader and look up the device version/model.
   • Open the download page of the Rom you installed
   • Download the version specific to your model
   • Install the Rom the usual way, but be sure to do full wipe/clean of all partitions first from the Recovery.

There can be two causes:

1. Hardware failure. Unlikely, but a possibility.

2. Each device has multiple sub-models, and each sub-model has multiple ROMs. You need to be sure you're installing the ROM meant for your exact device model, even if you are re-installing a stock ROM. If you do install a ROM not meant for your device, you often face issues like these.

   The solution for this is to first confirm your exact device model:

   • Boot into your device's bootloader and look up the device version/model.
   • Open the download page of the ROM you installed
   • Download the version specific to your model
   • Install the ROM the usual way, but be sure to do a full wipe/clean of all partitions first from the recovery.

There can be two causes:

1. Hardware failure. Unlikely, but a possibility.
2. Each device has multiple sub-models, and each sub-model has multiple roms. You need to be sure you're installing the Rom meant for your exact device model, even if you are re-installing a Stock Rom. If you do install a rom not meant for your device, you often face issues like these.

The solution for this is to first confirm your exact device model:

- Boot into your device's bootloader and look up the device version/model.
- Open the download page of the Rom you installed
- Download the version specific to your model
- Install the Rom the usual way, but be sure to do full wipe/clean of all partitions first from the Recovery.

There can be two causes:

1. Hardware failure. Unlikely, but a possibility.

2. Each device has multiple sub-models, and each sub-model has multiple roms. You need to be sure you're installing the Rom meant for your exact device model, even if you are re-installing a Stock Rom. If you do install a rom not meant for your device, you often face issues like these.

   The solution for this is to first confirm your exact device model:

   • Boot into your device's bootloader and look up the device version/model.
   • Open the download page of the Rom you installed
   • Download the version specific to your model
   • Install the Rom the usual way, but be sure to do full wipe/clean of all partitions first from the Recovery.