| Symptom | Likely Cause | Fix | |---------|--------------|-----| | Boot loop after update | Wrong U-Boot DRAM setting | Revert to P1-specific U-Boot | | Only 2 cores active | Missing SMP enable in DT | Check sun8i-t3-p1.dts status | | USB OTG not working | VBUS control GPIO changed | Revert GPIO pinmux to P1 revision | | eMMC write error | Bad block / partition table mismatch | fdisk -l and restore GPT |
cat /proc/cpuinfo | grep Hardware cat /proc/device-tree/model uname -a Quad-core T3 P1 Update