Hello everyone, I have an archos 50d helium Android 5.1 Lollipop, which practically when turned on remains locked in the logo screen, the one with the archos logo and does nothing, does not continue and therefore does not turn on. I turned it on with the vol + key entering in recovery mod and doing the various wipe cache, total formatting, but nothing has changed, the phone remains locked. I tried to download CWM and do apply update via sd but any file I put (even the phone's firmware i tried like 10 .zip file) has always given me E: footer is wrong, signature verification failed, Installation aborted. While trying to turn it on with the volume key - it does nothing and does not go into download mode. As soon as I put the charger on the phone, if it is off, it turns on and remains locked in the logo (Archeos), but I think it charge because it stayed for a long time in recovery mode or in logo mode. Obviously the phone does not turn on and I can not use it in the download mode because it does not enter or use odin. So I have no idea what to do with it. I was just installing an app, it turned off and from that moment on forever it seems. What do you suggest to do? Thank you.