I want go back to the original firmware on this switch. I read something about that it is easy to do over the OpenWRT Luci Gui in System/Backup / Flash Firmware. Just upload the original firmware. Could this the way? Because I read nothing about this possibility here: https://openwrt.org/toh/d-link/dgs-1210-16_g1
Does anyone know?
If the secondary partition still contains OEM firmware you can trigger boot failure for router to boot that by 5x interrupting boot/power before "fast blink" recovery pattern, or fw_printenv/setenv the boot fail variable to boot other partition or set default boot partition to other. That is IF OEM firmware is in other partition.
respectively just using setsys.