I'm sorry, I forgot to translate...
from russian web site
http://translate.google.com/translat...242e99&act=url
it seems that deleting the file
system/config/network.cfg
solves
(full path is mnt/ext1/system/config/network.cfg)
i don't know whether it works with 430 or it works only with 443
http://download.pocketbook-int.com/f...4_443_user.zip
anyway an user (with the 444 versione, the russian one) report problem opening file txt, fb2 e doc.
I've tested the deletion of network.cfg (I've the 443 ver.) and it works, so no need to do a factory reset