Hi,
I would suggest:
1) Do a full backup using the dd command as described earlier in this thread. In worst case scenario, this will allow you to fully restore the flash contents.
2) Do a second backup using the cp command and copy all relevant files/folder, which has been explained, too. This is required to restore the device prior to RMA or firmware upgrade.
3) Take your time to navigate in the telnet shell through all folder, to get yourself familiar with file structure. This is required to avoid problems/worst case scenario.
4) The hack involves renaming three files to dummy names. Once you figure it out, it takes you 1 minute. Then all the hacking fun is gone. Unless you REALLY need the enhanced frequency range, take your time.
5) Learn how to use the instrument before hacking it - that will allow you to check if it is working correctly.
Regards,
Vitor