followed instructions exactly, but can't get it to flash. Phone is in download mode. In the flash tool, once I selected port one in the settings, I click the yellow arrow. It says ready. Nothing ever happens after that, I unplug device and plug it back in and the box changes from ready to 'DOWNLOAD FAIL!! [0 sec]" lgp930at-01-v10j-310-410-feb-26-2012.tot FAIL. My device is not bricked, but my LTE/HSPA+ connectivity is broken on the stock rom, I tried flashing CM9 and to my surprise it fixed the issue. I also tried re-flashing the stock baseband and firmware while on stock but it also had the same LTE/HSPA+ connectivity issues (speeds below 1mb/s while cm9 I get 11mb/s on LTE).
EDIT: now after rebooting device LTE is working normally...
EDIT2: it appears the updated baseband/firmware that I flashed from http://forum.xda-developers.com/show....php?t=1582193
was causing the LTE connectivity issues. Flashed the stock baseband and firmware and all is working well. Hope this helps anyone that also had this issue.