Rkpx3 Mcu Update Access

Performance: update time, download resilience (resume), flash wear estimation.

Security: verify signature rejection, repeated attempts, downgrade prevention.

If the RKPX3 is based on the RK3308 architecture (a common choice for audio/IoT):

Reconnect via serial terminal. Send VER again. The version string should match the new release. Run a quick diagnostic: rkpx3 mcu update