Sometimes after an incorrect firmware update, the Android Box no longer starts.
What to do?
If it's an iTV-M8, you can restore it using an SD card for automatic updating.
For this

1. Download the software for preparing an SD card for automatic firmware updating (Amlogic BootcardMaker) http://drive.vensys.pl/share.cgi?ssid=09D0hhb
2. Next, unpack the RAR archive to a folder on your computer, e.g. "C:AmLogicBootcardMaker"
   Contents of the folder c:BootcardMakerBootcardMaker.exe
   06.12.2013 23:59 3 014 144 BootcardMaker.exe
   06.12.2013 23:59 44 544 Update.dll
   06.12.2013 23:39 250 update.ini
3. Download the latest version of firmware for Android Box iTV-M8, e.g. http://drive.vensys.pl/share.cgi?ssid=05TvfiT
4. Format the SD card to FAT32
5. Unpack the archive with the firmware onto the SD card. The files must be similar:
   Contents of folder X: (SD card)
   17.11.2014 08:40 557 aml_autoscript
   15.08.2015 14:02 62 factory_update_param.aml
   14.08.2015 21:48 365 809 940 iTV-M8_AP6330_k200-ota-20150724.zip
   24.07.2015 15:46 8 097 232 recovery.img
   24.07.2015 15:17 388 608 u-boot.bin
6. Next, run BootcardMaker.exe, as:
   
7. Click the "Choose disk" button and select your SD card. If your SD card has the letter H, then select "H"
   
   
8. Then click the "Open" button and locate the firmware update directory, select the "uboot.bin" file and open it.
   
   
9. Click "Make" button, then a "Success" dialog box will pop up if the operation was successful.
   
10. Next copy all update files to SD card, if there are same file names, replace them.
11. Preparing SD card for automatic update finished.
12. Now insert the SD card into the Box, then use a toothpick and press the recovery key through the AV jack without turning off the power, like this:
    
13. Next, the automatic firmware update will start and the Box will restart automatically after completion.