› UKTH forums › 🛜 Wireless Routers & Modems › ASUS & Wireless › Latest Beta Firmwares for DSL-AC51 to DSL-N66U incl. DSL-AC750 Latest DSL ASUSWRT firmware v9.1.2.3_502-g2bdb05b now available. (latest firmware’s are at end of threads) For following ASUS DSL Modem Routers: DSL-AC51 DSL-AC52U DSL-AC55U DSL-AC56U DSL-AC750 DSL-N10-C1 – (extended beta support...
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UK Sentinel.
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- December 31, 2019 at 10:30 am #5600
[quote quote=5598]
Well spotted, hopefully will be suitable for @jonathan changelog = alas no DSL driver update
Version 1.1.2.3_805 2019/12/279.36 MBytesASUS DSL-N16 Firmware version v1.1.2.3_805 (This product supports both Annex A and Annex B) Bug fixes and enhancements: – Now supports Feedback > 12 hours Diagnostic xDSL debug log capture feature for non-USB supported models. – Feedback > WiFi Diagnostic feature change log file name to “WiFi.log” instead of “TCC.log”. xDSL Diagnostic log remains to be “TCC.log”. – Fixed VPN settings > username/password, if special character “.” used leads to connectivity issue problem. – Fine tuned Feedback feature. – Fixed various Web UI related issues. – Fine tuned OpenVPN Web UI. Security: – Enhanced Security for specific Malware/Malicious Script protection.just a minor update, main issues still persists. high CRC errors and l2tp vpn problem.
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January 15, 2020 at 10:15 pm #5772dsl-ac51
Firmware version v1.1.2.3_805
vpn connection error: “write UDP: Invalid argument (code=22)”
??? why…
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January 16, 2020 at 7:07 am #5775[quote quote=5772]dsl-ac51 Firmware version v1.1.2.3_805 vpn connection error: “write UDP: Invalid argument (code=22)” ??? why…[/quote]
Did this problem happen with Firmware – Version 1.1.2.3_790 , if No then maybe try factory reset and see if issue remains
Firmware version v1.1.2.3_805 is a very ne release, hopefully not buggy
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January 16, 2020 at 9:40 am #5779Problem solved.
v1.1.2.3_805 – after facory reset problem still present, flashing v1.1.2.3_743 and add vpn profile, problem is gone, and finally update to v1.1.2.3_805 and everything is ok.
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January 16, 2020 at 9:56 am #5780[quote quote=5779]Problem solved. v1.1.2.3_805 – after facory reset problem still present, flashing v1.1.2.3_743 and add vpn profile, problem is gone, and finally update to v1.1.2.3_805 and everything is ok.[/quote]
Good news and thanks for letting us know

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January 16, 2020 at 11:25 am #5781So came to this after trying to get my old dsl-n66u back up and running, with the original firmware I get HR faults introduced on the line, so thought the beta firmware might resolve it?
I’m currenty on the v9.1.2.3_743, but for the 783/790/805 seems the DSL-n66u has been dropped?
I did see the direct link for 783 on post https://uktechhub.com/forums/topic/latest-dsl-asuswrt-firmware-v9-1-2-3_502-g2bdb05b-now-available/page/7/#post-4641
But that appears to have been removed?
Is 743 the last firmware available for the dsl-n66u??
Thanks :-)
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January 16, 2020 at 11:45 am #5782Basically, the DSL-N66U has reached is end of life, ASUS kindly provided unofficial updates beyond EOL but as they received a complaint about EOL Firmware, with no support, they (ASUS) have withdrawn all previously released DSL-N66U Firmware’s beyond
DSL-N66U_v9.1.2.3_707-g524aadd –DSL-N66U_v9.1.2.3_743-gf5b4545DSL-N66U_v9.1.2.3_707-g524aadd– DSL-N66U_v9.1.2.3_743-gf5b4545https://www.asuswebstorage.com/navigate/a/#/s/BDE1E747AA8341BFB1BA6EF4FC290597Yhttps://www.asuswebstorage.com/navigate/a/#/s/9A11A78AD414465B853617379C50D180Y
So the version you are currently running is the latest and no newer firmwares are available for download via ASUS
ASUS did release DSL-N66U firmware’s 783/790 so hopefully somebody else downloaded before they where removed, if so hopefully they can share or drop me an email and I can share via Forum Direct link etc

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January 16, 2020 at 11:55 am #5784Thanks for the response!
I got the 743 from https://uktechhub.com/forums/topic/latest-dsl-asuswrt-firmware-v9-1-2-3_502-g2bdb05b-now-available/page/12/#post-5781
https://www.asuswebstorage.com/navigate/a/#/s/9A11A78AD414465B853617379C50D180Y
Do you advise reverting to 707 as the last official one?
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January 16, 2020 at 12:08 pm #5785My apologies, I missed that one, the version 743 is newer, so should be more stable
(I will amend above notes to capture this later firmware)
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January 19, 2020 at 2:38 pm #5800Firmware version 1.1.2.3_805 now also online for the AC51 and AC52U.
https://www.asus.com/Networking/DSL-AC52U/HelpDesk_BIOS/
https://www.asus.com/Networking/DSL-AC51/HelpDesk_BIOS/I’m still on beta_rev708fa due to the 5G Off boot issue….
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January 19, 2020 at 2:40 pm #5804January 19, 2020 at 4:32 pm #5820Forum Member @Jani has kindly shared with myself two Recent firmwares for the DSL-N66U (many thanks)

DSL-N66U_9.1.2.3_783-g4cb10eb.trx
DSL-N66U_v9.1.2.3_790-g61d41b5.trx
“These files have been virus checked via myself, but UKTechHub.com has not liability for these firmware’s and there usage”
DSL-N66U_9.1.2.3_783-g4cb10eb.trx – [download id="5810"]
DSL-N66U_v9.1.2.3_790-g61d41b5.trx – [download id="5818"]
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January 20, 2020 at 3:57 pm #5833January 22, 2020 at 10:41 am #5843When I try to update my ac51 to 1.1.2.3_805 it says that the firmware is invalid. And I try to update it straight from ASUSwrt
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January 22, 2020 at 12:04 pm #5844[quote quote=5843]When I try to update my ac51 to 1.1.2.3_805 it says that the firmware is invalid. And I try to update it straight from ASUSwrt[/quote]
Went on fine on my AC51. Downloaded the file from the link a few posts back.
Please unzip the firmware file first then check the MD5 code.
DSL-AC51_1.1.2.3_805-gadd8a2b.trx MD5 hash: D99341ACA5898FC50CE3C91054819399
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