There is a multiboot plugin here in this forum and it is awesome .
It change the recovery multiboot to infinite slots using external microSD or usb pen drive.
The main thread in here
Multiboot FlashOnline by Madhouse (python2/3)
Main source
https://github.com/m4dhouse/Multiboot-FlashOnline
This is how it works from the dev.
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Note: You can return to the original way just download recovery_emmc.zip 15MB file from here
http://www.pur-e2.club/OU/imag…=6.5/airdigital/RECOVERY/
and unzip it to fat32 usb pen drive and connect it to the dec. then on it with pressing rear reset button till you see flash on the front panel then let it go.