Excellent stuff WarheadsSE!
Thanks for all your efforts!
@SomeoneOnLine:
To return to "Stock", Open a terminal and run:
$this->bbcode_second_pass_code('', 'fw_setenv bootcmd 'run to_stock'
reboot')
If you have a serial terminal, you can also stop the boot-process, and just enter run to_stock
You'll probably get some error messages during boot, as the Arch partitions will not contain a "volume" or any shares.
To totally return to stock, you'll have to do a full reset on the NAS.
After returning "to_stock", you should be able to return to Arch with:
$this->bbcode_second_pass_code('', 'fw_setenv bootcmd 'run to_linux'
reboot')
If you don't change anything in "Stock", I believe the Arch installation will be unchanged.
(Anyone feel free to correct me if I'm wrong)
It's not possible to have an actual "dual-boot", as the stock installation will want to re-format your partitions.
At least, that's how I've experienced things while tinkering with Arch and Debian...