Today i contacted with the asus live chat support, tried to get some help in this bad firmware update case.
I got the answers this below:
Peter B.
So you have already tried going back to the previous firmware?
Tamas Illes
yes
but nothing changed
Peter B.
Being that neither firmware is helping, I recommend an RMA for the router. You can request one be setup for it using the following link.
www.service.asus.com/#!rma-request/cope
Tamas Illes
I think, it would be better to withdraw this defective software from your website before it makes more problems to your customers.
Peter B.
We are not aware of any issues, I would recommend an RMA for it.
Tamas Illes
if you check the mentioned forum you will see lots of your customers has exactly the same problem!
Peter B.
Some one elses forum does not confirm anything really. I can pass your concern on to others, but no issue reported at this time.
Tamas Illes
ok,
now its reported, im the first one
you can sure you will get lots of report soon, if depends on this...
Peter B.
If it is an issue, it will be resolved. Is there anything else I can assist you with today?
SO because it seems this is a unreported issue, it would be nice if everybody who has the same problem report this in the link this below, or we can request RMA...
http://www.service.asus.com/#!b2c3/cpm1