It’s posible to downgrade v3 to 2.9.50 via uploading 2.9.50 packets?
Based on my experience, no. I have only made it work using netinstall.
Based on my experience, yes, it is possible.
Hey,
Of couse, I’ve done this remotely using VPN connection to my network 
- Upload 2.9.50 packages using either ssh or ftp.
- Select Downgrade (/system packages downgrade)
Regards, Kamil.
tnx ayufan, it works.
your wireless configuration will be reset if you downgrade
Right thing to do is - create an backup before upgrade to v3.0, then in case on downgrade you will be able simple to load it and no problems with downgrade.
fire,
is it possible to know the reason, why do you want to downgrade ?
We have two problems. One is
http://forum.mikrotik.com/t/v3-0-big-bug-bug-bug/18455/1 (solved in 3.1)
other is disconecting(only what helping is disable/enable card) after one day when link use nstrem, one computer is 2.9.x version and other 3.0. (still testing if is solved in 3.1).
Please make some easy way to downgrade to 2.9.50…and no lose wireless. HELP!!!
The 2.9.50 the last stable OS…
I had to downgrade because as far as I can tell, wireless for 3.65 Ghz using the Ubiquiti radio card doesn’t work with 3.1. Would never associate…
V3 is stable if you know what you are doing.
…
i have been facing a lot of problem with V3…about to use only ospf…don’t know ab the other feature… i have bad experience with RB333 and RB150 (tested with 40 pices Router Board…everywhere got the same result )…sometime i need to do enable and disable the sub-interface to announce my connected interface…I have configured it in cisco …ther’s i didn’t find any problem like this …is it any bug of mikrotik ospf …??? 
Stable…yeah ?
On x86 ?
Not only stable…very strong : http://merkur.wla.hu/mikrotik/support/3x2/highpower.jpg
..but true the last version (3.2) better. The nstreme wireless stable.
apu132,
have you ever contacted support and provided information about OSPF issues, that you have at 3.0 version ?
?? Are those real results? How is an Atheros AR5213 able to push and receive over 200mbps at the same time?
of course it’s not real
Few. Thought I had missed something amazing in the release notes 
dear,
yes…at first i have contacted with them …they just suggest me to change the os version…nothing else i got any sugession from them…would u plz help me ab the RB 333 that how do i change the ios to 2.9.50…and if i need any older ios then how do i have it and where ???
thanks and need an quick reply