ADB change recovery partition?!

[FTeinz]

Hello. I'm new here and hope you can me to clear some questions about my TV Stick MK808B plus.
I have flashed a custom rom (superceleron 1.4b ) but when I was enter the recovery, the only I see was stripes.
After that I was downloading a avoidable recovery, I was flashing these but without success.

Now I can`t access my recovery it boot direct into android and have only with adb root access.

Now my questions:

Is it possible to change/over write the absolute not working recovery partition with my old recovery.img only with ADB root access again?

pros:

-adb has root
-all files there

cons:

-ADB Fastboot don`t recognice a fastboot device!
-I have tryed with flash_image binary (adb shell flash_image boot /sdcard/boot.img) but only: get error scanning partitions
-no root access from Apps like root explorer
and
-I have not enough knowlege and help
cat /proc/partitions give me:
major minor #blocks name
253 0 512000 zram
0 250 0 524288 cache
250 1 32768 logo
250 2 32768 recovery
250 3 32768 misc
250 4 32768 boot
250 5 1048576 system
250 6 5771264 data
179 0 65536000 mmcblk0
179 1 65534976 mmcblk0p1

The recovery is there but don't work.
Please help

Thanks a lot

regards
FT