Record to SD card image Armbian (it is bootable). Copy of the dtb directory into the root of the SD card file "kvim.dtb" and rename it to "dtb.img". Rename the file s905_autoscript in aml_autoscript (replacing the existing file). Unplug the PSU from the VIM. Connect to a VIM keyboard. Connect to VIM prepared the SD card. Short pins of the register M to switch the PSU on. After 5-10 seconds, release the contacts of the register M. in a few minutes, you should start system from SD card. Log as root (password 1234). Perform the initial configuration of the system. When you restart the system you need to again close the contacts M of the register (something the system was able to boot from SD card). After the secondary system start-up and login created a new user, you can switch to "root" and complete the erasure is not correct u-boot, or record a new one (the correct u-boo). By the way, if you prepared in advance a system Armbian on the SD card (prior to any experiments) and created a full backup, then the recovery process would be much simpler. Have poluchili map, closed contacts M of the register, started the system and immediately undertook a complete restoration to its original status (this is done with one simple command in the terminal).