[Q] Cannot Update/Install Apps: How to fix appname unsuccessful?

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Has anyone found a quick way to fix the "appname unsuccessful" installer failure on the Xoom? I cannot install or update any apps as of this morning.

A Google of the problem does not come up with anything Xoom/Honeycomb specific but says that on other devices the procedure is to delete smdl2tmp1.asec from the .android_secure folder. However I cannot find this folder or file? I have Astro and ES explorer but neither can see the folder (I have show system files on) and nor can windows when it is connected by USB.

My Xoom is un-rooted and I cannot install any apps like root explorer (which may help) due to the fault.

Apparently a hard reset fixes it to but frankly it took so long to set the thing up how I want, I would like to avoid this if at all possible!

Thanks in advance,

Jim

Have you gone to settings/apps/manage apps/all tab/market/force stop/wipe data

Thanks for the reply.

Sorry, I should have mentioned but I have tried that - not working.

I am currently in process of backing up all 30 ish Gb to laptop to do factory reset if I cannot find an answer by this evening :(