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[Magnetron1]

   Today I downloaded and installed the new firmware and so far nothing has exploded ! The configuration file created by the previous beta release 121b07NA seems to be 100% compatible with it. I didn't have to change anything. The Status web page displays Firmware: 1.22NA 2009/12/23. Also, I noticed that no release notes file was included in the Zip package. So ... D-Link ... What got tweaked ?

   Get your copy at ftp.dlink.com/Gateway/dir855/Beta/Firmware/

Regards,
Magnetron1

[Cranium]

What changed would be my question as well.  I won't upgrade to a beta version unless it is something that will really help me. 

If it bricks your router, they won't support it.  Even if it's because of bad code they provided.

[taz3d]

Upgraded my dir-855 and it's still working. 
Only one problem, the router only connects at 150mbit.
With the 1.21 beta firmware it had a solid 300mbit wireless connection, nothing changed in the routers config so this is weird. 
Anyone else with the same problem  ?

[lizzi555]

Did you rest the router ?
Even if the update did not change the settings, you should reset it to factory defaults and configure new.

Mine seems to have a slightly improved 5GHz connection and 2.4 GHzis working as before with 300Mbps.

[taz3d]

The reset solved it.
Router running @ 300mbit now. no stability problems
Thanks 

[Syaoran]

Has this resolved any of the wireless packetloss and wireless errors associated with the 1.21 beta 0x firmwares? 

[Lycan]

Upgraded my dir-855 and it's still working. 
Only one problem, the router only connects at 150mbit.
With the 1.21 beta firmware it had a solid 300mbit wireless connection, nothing changed in the routers config so this is weird. 
Anyone else with the same problem  ?

Check the Channel Width setting. IT now defaults to 20 instead of 20/40 Mode. That would cause the 150.

[systematic]

Can people in Europe with A2 hardware use this?

[lizzi555]

Yes, you can install this firmware but you can't switch back to EU versions afterwards.

[Syaoran]

I've ben running it since last night and I have 0, that's zero wireless errors on either channel so far.  Definitely better than the 1.21 beta 07 so far in my opinion.  I'll be waiting a few weeks though before I pass judgement on this firmware though.

[rahilio]

should i upgrade to this or stay in firmware 1.12?

[siliconrage]

I just installed this new beta firmware last night and the range and speed on both the g and n are INSANELY increased and wonderful ! The only problem so far is that I still get wireless restarts on the wireless g side of the wireless ? Is anybody else getting the same results or is it just me? I still have not seen what exactly this new firmware changed or improved. I would love to hear other peoples results on the wireless restarts or the lack there of. Thanks dlink for continuing to support a potentially great router!

[Syaoran]

should i upgrade to this or stay in firmware 1.12?

I'd say hold off.  I regret upgrading past the 1.12 and I was only stuck with the 1.21NA beta 07 for a couple of weeks until the 1.22 beta 02 came out. 

[Syaoran]

Packetloss seems to have disappeared but I still get errors on the 2.4GHz range.  ):

LAN Statistics
Sent : 4577724 .

TX Packets Dropped : 0 .

Collisions : 0 .
 Received : 6500118 .

RX Packets Dropped : 0 .

Errors : 0 .
 
 .
WAN Statistics
Sent : 6406752 .

TX Packets Dropped : 0 .

Collisions : 0 .
 Received : 4560522 .

RX Packets Dropped : 0 .

Errors : 0 .
 
 .
Wireless Statistics – 2.4GHz Band
Sent : 77072 .

TX Packets Dropped : 0 .
.
 Received : 90 .

RX Packets Dropped : 0 .

Errors : 347 .
 
 .
Wireless Statistics – 5GHz Band
Sent : 9014 .

TX Packets Dropped : 0 .
.
 Received : 0 .

RX Packets Dropped : 0 .

Errors : 0
 
Yes, I restored the router to defaults, flashed the router, and manually set everything back up. 

[lizzi555]

It is quite normal that you get errors, otherwise you would always have 100% - 300 Mbps connection 
This is wireless - important is the number of errors.

Wireless Statistics
Sent : 524983
TX Packets Dropped : 490
Received : 285319
RX Packets Dropped : 5
Errors : 41

If you have a higher number of errors, most likely something is affecting your wireless negatively.