I had updated today to the 1308 firmware to my lumia 620 after waiting for a week time for OTA. I used nokia software update for retail (thanks to all those shared the links and infos), My Lumias current firmware is 1030.6407.1308.0002. I checked for my other storage fix, it was not there then I forced extras+info update through the QR links(thanks to all for sharing), Then it is through, Big relax.
Note: When it reboots it need a data pack activated sim to sign in your existing Microsoft account for reinstall your backups using wifi, if not you will end up in error that needs a soft reset to signin to your microsoft account.