hmm not sure bout this, since someone post this before ..
maybe try this way

setting -> sony ericsson -> setting download 

just a few page before someone post this .

for the camera bug, no nid to reboot..

after finish taking a shot, kill the task by going to settings>applications>running services, press the right below, find camera task n stop it..

finally root my ARC... huhuhu..

CAN ..as long as u havent unlock ur bootloader. .

im using sd card class 10 and still having a problem with it.. already try to boost the speed tru sd speed increase apps.. still the problem persist..
guess we need to wait for the firmware update.

im using DNA brand, got on garage sales.. u might need to try other brand.. transcend/kingston etc..

here my speed test of my microsd using sd tools apps..



it really does perform on class 10 speed..

anyway u go buy other brand and post the speed test here 

0:38 , its stop for one second..but i dont find any audio sync prob.. 

can you try rec in 3 minute? maybe some movie with dialogue 

Finally, the lag is gone, 2 videos captured, both more than 5 minutes, both no lag or stutter, what I've done is I switch to Flight Mode, clear all tasks than start capturing. That's it, Can some of you guys test it to confirm?

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Added on May 13, 2011, 6:18 pmthe 3rd video captured is a failure, guess there's no HD recording until it is fixed then