1) While I am editing, can I close and open the PuTTY without danger while I have not saved the changes? (:wq)
2) Assuming the worst case, if a mistake is made, is it possible to reverse it? reinstall the firmware, set it factory default, and start over?
1- yes if you use the "x" bottom on top ,the setting won't be saved.
2- in theory the worst case scnerio is that you'll need to reset the miner. but still shit can happen.
since you are not going to do any coding , you shouldn't make any mistake, before you save just revise the code 2-3 times, compare it to the prev code you pasted here, make sure you have not deleted anything.
This can be solved a lot easier.
'openssl' is not used by the miner for day to day operations, so just move it out of the way and replace it with something that returns status code 0.. folk generally don't know how to use vi.
My miners are down at the moment so I don't know the file paths, but you should be able to do:
ln -sf `which true` `which openssl`
Those are back ticks, not quotes. Assuming 'true' exists (I think it's in busybox), this would simply replace openssl with a symlink to true... which will return 0 no matter the arguments provided... and would bypass the signature check.
-j