Can't update

[MrPatate87]

Hello,
I use 2 yi cam y20ga and I decide to lake the update of the yi hack of this cam from 0.2.7 to 0.2.8, one of my camera have no problem to made the update, but with the other one I can't do the update with the integrated web page. always fail with "Unable to download firmware" issue.
The two camera are on the same network and was well connected (using it with camera station witch have the video flux), can access to the webpage to configure it, but I also notice I can't delete records on the issue camera with the web interface.....

I try to access it with ftp, can access it (but don't know where are stored video if it can be memory problem).

What can I do to upgrade this camera? (the first one made the update without any issue in less than 5 minutes)