# UPDATE FAILED
**Something went wrong during update**
Probably you have chosen wrong file (too big or too small) or you were trying to update ART on device with unknown FLASH type (and size) which is not allowed.
Please, try again or contact with the author of this modification.
You can also get more information during update in U-Boot console.
using router’s web interface,
the router rejects .img files as per image below
note: the router accepts .tar files