I've a second hand, privately owned Blackberry 7510. If I attempt to load any 3rd party java apps, I get the dreaded digital signatures are invalid message. This blackberry is NOT associated with any BES. However it previously was. I suspect that the 3rd party installation option was at one time disabled.

My reasoning is that I may have something still in memory from this machine's pervious life. So how do you totally blank a blackberry? I've done the wipe memory from the security menu. I've done the 10 bad passwords. But it seems that some things are still retained. Even after the memory wipe and bad passwords attempts, the machine still has my password history, so I'm conviced I'm still not able to get it back to a completely clean state. If there is something in the blackberry that get's set by BES for 3rd party application loading, I expect its in the same memory that's got my password history.

Anybody have any ideas? I can't seem to find anyone, including Tech Support at Nextel that seems to have a clue.

I have two wants: 1) how to get around the digital signatures issue, and 2) is there a method to truely blank a blackberry. Anybody know how to do either?

There's a bit of a problem here. You can totally wipe a BB - data, applications and OS, with the "Javaloader" program found in several threads here. That's easy. Then you reload the OS.

If there was an IT Policy loaded onto the BB by the former owner's company, you have a problem. Javaloader does not wipe out the policy.

There may be some people here who have the knowledge to help you wipe out a policy. It is not easy.

NJBlackBerry; Thanks for confirming what I suspected. Not sure if I was explaining the situation well or not to some of the support people I've checked with as nobody seemed to understand what I suspected was going on with my Blackberry. Hopefully someone out there can point me in the right direction?

As I'm learning some of the keywords and details on this subject, looks like its best to reference the "Disable Security After Leaving an Organization with BES" topic.

I think we're done here.

I've tried several avenues, but I have no access to the original BES. I have no access to itpolicy or the .bin file. Nextel Tech Support says there's no way to clear the IT policy short of getting back on the original BES.

Nextel customer service agrees that I can't do what I want with my device, but they have NO way to let me out of the contract or get me a new or different working device other than me paying for it.

So for anyone wanting to go with a Blackberry, especially second hand, you better be extremely careful to find out if the device has ever been associated with a Blackberry Enterprise Server. I'm a techie myself, I understand the need for the data security. I don't understand why there isn't a total memory clear on these devices though. There shouldn't be any harm if the mechanism deletes the policies and the data together is there?

Also would warn people to be wary of Nextel customer service. I wished I'd had a voice recorder going when they acknowledged that I didn't have full control of my device, that certain features were turned off that one might want, and that all they were going to offer was to let me buy my way out of the contract.

If I sign another carrier's unilateral, forfeit all legal rights, you must use arbitration contracts again, then I guess I'm the stupid one....