Found. If you are interested then:
Loaded on the tablet installed ubuntu, created in the root file system of Linux "sdcard" folder and placed in it "twrp-jb.blob".
1. In a terminal as root flashed recovery:
dd if=/sdcard/twrp-jb.blob of=/dev/mmcblk0p4
2. scored zeros mmcblk0p3:
dd if=/dev/zero of=/dev/mmcblk0p3 bs=16 count=1
after rebooting normally booted recovery !