I’m trying to enter upgrade mode from the 5.5-rc2 kernel + mainline U-Boot from Fenix.
TST, Keys mode, and serial mode from: https://docs.khadas.com/edge/HowtoBootIntoUpgradeMode.html are not working.
In U-boot update and maskrom are undefined.
Can anyone help? I want to revert to the 4.4 kernel using the rk-burn-tool but can’t get into upgrade mode.