Your device gets stuck on the logo screen, continually restarts, or fails to boot into the OS. Flashing the stock firmware is often the only fix.
| Problem | Likely Cause | Solution |
| :--- | :--- | :--- |
| Wi-Fi won’t turn on | Wrong Wi-Fi driver in the image | Use fastboot flash wifi with a correct nvram.txt file. Or root and replace /vendor/etc/wifi/wlan_mac.bin. |
| Touchscreen inverted (Y-axis) | Kernel mismatch | Flash an updated uboot.img from version 1.8.7 hotfix. |
| Device shows 1GB RAM but you have 2GB | Incorrect DDR parameter file | Extract the parameter.txt from firmware, edit DDR=2G, repack and reflash. |
| Remote control not working | IR key mapping changed | Root → navigate to /system/usr/keylayout/ → replace sunxi-ir.kl with your backup. |
| Battery drains fast (on portable devices) | Missing power management drivers | Disable “Keep Wi-Fi on during sleep” and install Kernel Adiutor to set governor to “conservative”. | Pd1731-a-1.8.7 Flash File
The stock firmware includes Chinese adware, launchers, and telemetry. Use a system app remover (after root) to delete: Your device gets stuck on the logo screen,
| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | “S_DL_GET_DRAM_SETTING_FAIL” | Wrong firmware version or corrupted download | Re-download Pd1731-a-1.8.7 from a reliable source | | “Error: Status BROM CMD FAIL” | Driver issue or USB cable problem | Reinstall drivers, use USB 2.0 port, change cable | | “PMT changed for the ROM” | Partition layout mismatch | Use “Firmware Upgrade” mode instead of “Download” | | Device not detected at all | Missing preloader driver | Manually install the driver using device manager | | Stuck at 0% or “DA DLL” error | Security mismatch or auth file required | Some newer Unisoc chips need an authentication file (unlock code) | Or root and replace /vendor/etc/wifi/wlan_mac