After root you can restore the original kernel (the latest), with root working.
The procedure works... so nonsense or not... who cares
Piuttosto ringraziare il tipo per averlo detto XD
Try with the SIM card inserted :p
Yes I solved both problems putting in parallel a pair of (crappy) earphones. No audible audio signal loss noticed.
You can use a jack splitter http://www.autistici.org/ackme/projects/howto/howto_double%20dolby%20surround.it.02/6_sdoppiatore_jack...