BB Curve :: Application Err 523?

Noticed at the end of a charging cycle from fully discharged state, that my Blackberry Curve 8520 was displaying"App Err 523ESET"n a white screen.The BB has now become unusable since it has remained in this error state inspite of various resolutions tried as below. ave already tried the following1. Tried hard Reset by removing and putting back the battery. After the usual booting delay of about 2 mins, the BB displayed "Blackberry" on the screen and which was followed by the dreaded white screen again with the above error.. Tried Soft Reset by pressing "alt" kay, "shft" kay on right & "del" key simultaneouly. The BB reboots, but at the end of it, displays the same 'App Err 523' as in 1 above.

3. Tried updating the OS from Blackberry Desktop Manager Ver 6 (?) .....
a) physically connected the BB with USB cable to Laptop ( Windows 7 ) while BB sreen showed the above error.b) Desktop Manager pops up a window displaying 'not able to communicate with the device' and prompts o 'Retry' OR 'Update' OR 'Cancel'.) Clicking on 'Retry' does not help. The same message window pops up again.d) Clicking on 'Update' pops up a window stating 'Checking for available Updates' but goes in indefinite Wait State. While in this state, triggered Soft Reset ( as in 2 above), causing a Reboot. While rebooting, communication with between Desktop and the BB takes place and a new window pops up displaying " No updates available at present" and asks to provide email id "for receiving updates when available".

e) Also tried to boot the BB in Safe Mode by hard booting ( with battery removal & putting back) and by keeping ESCAPE key pressed. The BB Did not boot in Safe Mode, but at the end of the booting cycle, displayed the same 'App Err 523' as in 1 above. ( this also dispells the popular notion that a BB goes into this "App Err 523" state because of some third party applications, since any third party applications are supposed to be bypassed when booting is done by keeping ESCAPE key pressed.