Boot recovery image in OpenWrt

Installing and Using OpenWrt
1

I want to repartition the UBI volumes of redmi ax6000, is there a way to boot using the recovery image from the command line?

2

what recovery image ?

3

initramfs-factory image used in the installation instruction.

4

Or is there a way to let uboot try booting initramfs first instead of ubi?

5

Does the uboot support usb booting ?
Then you could configure it the same way it's done for the WRX36.

The instructions are at the bottom of the device page.