You need 1)an eSATA station, 2)an eSATA cable from the station to E3 flasher panel, and 3)a way to enter PS3 service/factory mode (most dongles should work, Khalkedon used "PSJailbreak" dongle in his downgrade video).
You probably can use your tablet if it supports "PSGroove".
To be on the safe side and not waste time, buy and use a dongle.