DTB Modifier simple tool to modify GPU voltage from dtb for qualcomm

This tool allows for convenient modification of the GPU voltage in the kernel DTB of Qualcomm Xiaolong devices (Android phones), verified on the Xiaolong 870. Users should verify compatibility with other SOCs, as the tool is theoretically universal if the DTB file structure is consistent. Users must avoid using 100MHz<GPU frequency≥1GHz and voltage value≥0xFFFF, as incorrect bit changes can result in erroneous voltage values. Voltage modification is risky and should be done with caution, as users bear full responsibility for any consequences.

How to Use:

1. Extract the DTB File: Ensure your phone is unlocked and has a third-party TWRP installed. Extract the DTB file from your current kernel without mixing files from different kernels.
   
   
   
2. Modify the Voltage: Use the tool to open and edit the DTB file. Modify either the hexadecimal or decimal representation of the voltage and the other will update automatically. Modify repeated frequencies to ensure changes take effect.
   
   
   
   
3. Verify Modifications: Compare the old and new DTB files using tools like Beyond Compare to confirm only the voltage parts were changed.
   
   
   
4. Replace the DTB File: Back up the original file, rename the modified file to match the original, and replace it in the flash package.
   
   
   
5. Flash the Firmware: Use recovery to flash the modified firmware package.

Q&A:

• Why modify the DTB file? Adjusting GPU voltage can reduce heat and extend battery life, though excessive reduction may cause instability.
• Why not change the GPU frequency? Frequencies must match those in the kernel, or the device will fail to boot.
• Why not decompile DTB to DTS? Direct binary modification of DTB is safer due to fewer differences from the original.
• How to verify voltage modification? Significantly reducing the voltage of a specific frequency and testing for instability can confirm changes.
• Can CPU voltage be changed? The location of CPU voltage control is unknown; contributions from knowledgeable users are welcome.