If you have followed every step of this guide and the device remains dead, the issue may be hardware-related:
Your IMEI numbers are stored in the NVRAM partition. If this gets corrupted, your phone will not recognize any SIM card. Use to back up NVRAM after the firmware fix. pritom m10 firmware fix
This example assumes U-Boot present and accepts loading kernel/rootfs from SD card. If you have followed every step of this
To fix bugs and improve performance, check for official OTA updates by navigating to Settings > System > System update Wiping App Cache: pritom m10 firmware fix