Done upgrading my 9810 to OS7.1, almost make me faint. Damn. Was having issues to complete the upgrade.

If any of you have problem to get your laptop/PC to recognize your phone, although you are sure it was working before without any problem, make sure to stop the BB desktop manager processes that is being auto executed via task manager (thats how i get mine to work at least.) Seems like when BBDM have reserved the port, Apploader wont be able to recognize it anymore. I tried all the method / solution provided without success. What make me get this idea was because BBSAK wont connect to my device also if BBDM background processes is running.

Btw TS, could you specify the error msg (on your step by step guide) after wiping the device as "Error 507" i had a minor shock after wiping my device as i expect only a blank screen with "Error". Hahahaha