My tablet is stuck on "no command" screen. What can i do? I've a Lenovo Tab A8-50 which received yesterday an OTA update.

After the update it didn't restarted correctly.

It now only show the "no command" screen. When I click the power button it shows this additionnal information

Android system recovery &lt;3e&gt;
A5500F_A442_000_027_141207_ROW


followed by a list of recovery options


Apply update from ADB
Apply update from sdcard
Apply update from cache
wipe data/factory reset
wipe cache partition
backup user data
restore user data


The problem is I never tried to connect that tablet to my computer using any kind of debug mode, only using standard USB mass storage driver.

I have one microSD card I can use, but it seems this mode doesn't allow me to push firmware from the microSD card to the Android machine.

So ... the question is simple : how can I restore/reinstall a working version of Android on that tablet ?

One additionnaly point is that, as far as I understand, Lenovo doesn't provide any link to the full firmware for that tablet on their support site. So where can i get a working version of firmware, and how can i reinstall it ?
I had the same problem and I spent hours working on it.  

Excerpt from this article which helped fix my problem.

When flashing TWRP, do not reboot (into system) since the default "recovery.sh" file replaces TWRP on every boot. So I guess you need to flash TWRP again 

So next time you flash TWRP,
1) power off (preferably by pulling battery if nothing else works)
2) enter bootloader or fastboot mode by holding particular button combinations (Google your phone's model to find out)
3) boot into recovery (TWRP)  

NOTE that the first time you boot into recovery twrp will ask you wether you want to make changes to the system... Choose "yes"... And then you will have proper recovery (TWRP) working.