I have v1.3 (SD build). Is there an easy way to update to 1.5?
Following are few posts I found in this thread (from 1.3 to 1.4 update):
1) turned off my phone and booted in to Magldr.
2) Select option 4 (USB MassStrg)
3)Make a backup of my current v1.3 data.ext4 file to my PC
4)Open latest version of 7zip and extract the newly downloaded v1.4 to desktop
5)Copy all v1.4 files except data.ext4 file and paste it inside ICS folder on SD card
6) Unplug USB cable, boot AD SD, let it boot up, once booted, restart the phone just in case
I did it slightly different. Backup ics folder from 1.3 version, copied files from the zip (1.4 version) to sd card. Run clrcad and haret untill working. Only then replace data.ext4 from 1.3 version over the data.ext4 from 1.4 version. With phone on pc under wm6.5. You can easily try as i understood you made backup from 1.3...
I have not tried above yet.
May be "update" info can be added in first post or to SD FAQ.