Using W7 laptop, I have a Nuvi 1350 HWID 972 w/ 2.70 OS. When I tried to flash an OS update, it did not complete and then displayed software missing prompt. I was finally able to get it to show up in Windows by batching Quick Cure and loading the BIN file. However, another curious problem has presented. It appears the entire unit is in read-only mode. I can delete files (unused languages) to clear up space and it shows the file deletion. Yet when I reboot the unit (again using quick cure) the file system is unchanged and has reverted to the original. When I check Garmin folder attributes, it shows read only. I uncheck that, and delete files, but they return on the next boot. Almost as if it is a locked image. I have seen this occur before once or twice in a Nuvi 765 and 1690 and could not solve it. Any suggestions?