To boot into recovery, you just need to copy the proper "recovery.img" to the root of your sdcard and than use the "toothpick method"
Important: Unplug OTG cables if any, otherwise it won't boot from Sdcard.
Wrong file or wrong named file and the device won't boot into recovery.
No need to tinker with "bootcard maker" (which never worked for me), or uboot.bin files.
Tried it with different devices (Minix X8/Ott M8) and it always worked, but it needs the correct recovery!
If your device is rooted, open a terminal and execute
ls -l -R dev/block
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