qnap 109, wipe disk and restore

["rosea.grammostola" <rosea.grammostola@gmail.com>]

Hi,

Atm I've Debian installed on my qnap 109 II. I want to restore the 
original firmware of qnap and wipe the whole disk first. Can I just wipe 
the whole disk and then follow the recovery instructions or are there 
some things to take care for first?

Thanks in advance,
\r


PS: Debian is running in my Qnap 209, thx for support!