I was rooted with 4.0.4. Utility, I upgraded to JB 4.1.2. Lost root. Tried Dans razr_blade but got the following error series:
[*] Press enter here once you have completed the above steps.
read: 41: arg count
83 KB/s (3477 bytes in 0.040s)
[*] Rebooting device...
[*] Waiting for phone to reboot.
[*] Phase three (this will take a minute)...
failed on '/data/logger' - Permission denied
mkdir failed for /data/logger, File exists
Unable to chmod /data/logger: Operation not permitted
link failed File exists
[*] Rebooting device...
[*] Waiting for phone to reboot.
[*] Phase four...
2575 KB/s (91992 bytes in 0.034s)
4226 KB/s (1867568 bytes in 0.431s)
3180 KB/s (574184 bytes in 0.176s)
1250 KB/s (63838 bytes in 0.049s)
[*] Cleaning up...
/system/bin/sh: su: not found
[*] Rebooting...
I really like 4.1.2 but would like to get back my root access.
Any help/advice would be appreciated