i'm having trouble upgrading firmware of my SPA525G2. if i upgrade to firmware version >7.4.6 after phone reboots it does not show any image, screen just stays lit but blank. I can connect to phone's web interface and downgrade firmware to 7.4.6. I tried all firmwares and every single one gives me this result.
Just wondering if anybody have expirienced this and if there is a solution for it.