Hi,
I suggest always to go to Stock before chaning to Padvan/OpenWrt/Pandora.
OpenWrt -> Stock -> Pandora
When i was on OpenWrt i first updated the "bootloader" to "breed". This then makes it easy to go to Padvan/OpenWrt/Pandora/Stock. Search the Web for instrunctions on Breed
To update "bootloader" while i was on "OpenWrt" i did as below.
Connect via ssh to the router:
cd /tmp
mtd_write unlock Bootloader
wget --no-check-certificate https://breed.hackpascal.net/breed-mt7621-xiaomi-r3g.bin
mtd_write write breed-mt7621-xiaomi-r3g.bin Bootloader
mtd_write verify breed-mt7621-xiaomi-r3g.bin Bootloader
reboot
If you miss mtd_write then you can:
SSH to the router, and execute the command:
opkg update
opkg install kmod-mtd-rw
insmod mtd-rw i_want_a_brick=1
mtd unlock /dev/mtd0
mtd -r write /tmp/breed-mt7621-xiaomi-r3g.bin Bootloader
reboot
To flash with "Breed":
Before the power on, press and hold the reset buttom until the light blinks stable.
Now you should able to access the BREED interface though browser 192.168.1.1
https://downloads.pangubox.com/pandorabox/18.10/targets/ralink/mt7621/packages/
Ciao
Attaros