Installation on Buffalo WBMR-HP-G300H

Hey there
I've done my homework and read the wiki/forum, but most of the info are quite old and I'm not sure how to proceed and I'm afraid to brick my device.

I've currently got a DD-WRT (v24-sp2 04/15/13 std) installed on my buffalo and would like to install the latest stable OpenWRT (v.19.xx I guess).

I can telnet my device and I would like to install OpenWRT from there, but would you please help me with the correct commands to do that? In particular, about the right file to download. The latest wiki instructions are relative to v.15.05 release and I doesn't seem to find the counterpart image file for v.19 on the repository.

Oh BTW, I'm not interested in the DSL connection part because I'm repurposing this device as a simple router, so AnnexA or B doesn't make big differences I guess.

Thank you very much in advance

19.07.3 is mentioned (which should be close enough)

For OpenWRT v19.07.3 we must use mtd, as long as sysupgrade does not seem to be installed (example for Annex A):

cd /tmp
mtd -r write openwrt-19.07.3-lantiq-xway-buffalo_wbmr-hp-g300h-a-squashfs-sysupgrade.bin linux

It does not appear to be possible to flash OpenWrt from the DD-WRT web interface.

? lists 19.07.4 images for annex b, but images for annex a are also available.

(Note: the above firmwares are for Annex B (ISDN). For Annex A (POTS) substitute wbmr-hp-g300h-a for wbmr-hp-g300h-b in the above urls.)

I don't know how I missed that, i'm very sorry.
Not my smartest debut :sweat_smile:

Thank you very much