You can download the required files here
To install either download the zip to a PC and extract recovery.img and flash just this image to the tablet.
OR
- download the zip to the tablet and extract the files to the root of the sdcard (if you extract them elsewhere then you will need to edit the instructions following)
- using esfileexplorer
- mount system rw and copy flash_image from the root of the sdcard into system/bin overwriting the existing file (I don't think this step is required but am not certain if I have upgraded the version in my roms so better safe than sorry)
- check the permissions are as the other executables in the bin folder
- Start a terminal session and enter the following
su flash_image recovery mnt/system/sdcard/recovery.img
su reboot recovery