ZGemma Star H2 Help Backup

Hi to all,
this is my problem, i have a ZGemma Star H2 with Open.Atv 5.1 (before 5.0 and the same problem of 5.1).
The problem that occurs is the backup. When I do a backup after I installed some plugins and I try to restore from the same backup image remains the fllash written. Is there a dimension that I don't have to overcome? There maybe a size of space that I have to leave within the decoder? Or is there another way to make backups?

Thnks and if you want i can post my backup or send it to you as tou prefer.
But tell me, if is it possible, also with your backup for zgemma i have the same problems.
if i change something backup do the same thing.