Hi Damien, I have no idea on the CRS109 support. However, I've generally given up on 4G USB modems as I've found too many times they let you down when failover is critical due to a quirk of some sort... My go to now are the Teltonika RUT240 (sorry Mike ☹) the bonus is they have Band 28 support too, I've got a few dozen scattered around with 100% reliability so far. Hope this helps, DB -----Original Message----- From: Public <public-bounces@talk.mikrotik.com.au> On Behalf Of Damien Gardner Jnr Sent: Saturday, 10 July 2021 2:50 PM To: MikroTik Australia Public List <public@talk.mikrotik.com.au> Subject: [DKIM Failure] [MT-AU Public] MF823's on routerOS? Hi Folks, We had a bit of an outage at work this morning, and I was a little surprised that my 'net at home went down - it should have just failed over to going via VPN over the MF823 with Telstra 4G that I have had plugged in for YEARS here.. Finally had some time to sit down and check, and the LTE interface is nowhere to be found. Rebooted the CRS109 incase something was hinkey.. No go. Moved the MF823 to another CRS109.. Still no go. Swapped in a spare MF823.. STILL no go.. These are on 6.47.10 and 6.46.8. Tested on our travel router (RB2011, 6.45.6), and lte1 comes up fine! Have Mikrotik removed support for MF823's in the last 12 months?? Anyone have a suggestion of something not crazy expensive to replace them with? :) -- Damien Gardner Jnr VK2TDG. Dip EE. GradIEAust rendrag@rendrag.net - https://click.pstmrk.it/2t/www.rendrag.net%2F/YYsaliMN/OHBV/RUqHRZAp5S -- We rode on the winds of the rising storm, We ran to the sounds of thunder. We danced among the lightning bolts, and tore the world asunder _______________________________________________ Public mailing list Public@talk.mikrotik.com.au https://click.pstmrk.it/2t/talk.mikrotik.com.au%2Fmailman%2Flistinfo%2Fpubli...