Bert, DD5XL

$PCAS04 can be easily patched in the current V1.10 FW's .cdd file at addr 0x000863dF, change it from 0x33 to 0x31 and flash FW to the target as usual. There...

There is no static CRC16 appended to the cfg strings, instead there is just a '*' 0x2A as a marker for the dynamically calculated checksum to follow after. Hence you...

Given your communication trace is correct, as the Asterisk "*" is present in the firmware flash image for each cmd, the resulting sequence may be constructed in a wrong way...

Yes, confirmed! As a countercheck I've just logged the initialization sequence on my (upgraded) 878 V1.21, looks similar to Thomas' log above: ``` $PCAS02,1000*2e $PCAS03,1,0,0,0,1,0,0,0*02 $PCAS04,31a $PCAS02,1000*2e $PCAS03,1,0,0,0,1,0,0,0*02 $PCAS04,31a ```...

> I am wondering if the latest 1.22 firmware fixes the checksum calculation. Changelog doesn't seem to mention it, but hope's still there... Nope, issue still persists in V1.22. :-(...

Hi Frank, I suspect a failure in the AF amp. It consists of a HM8872 Class AB / D audio amp. See http://hmsemi.com/downfile/HM8872.PDF for the datasheet with sample circuit. (Google...

With a bit of fiddling it should be possible to use a [SSM2305](https://www.analog.com/media/en/technical-documentation/data-sheets/SSM2305.pdf) amplifier IC by Analog Devices. It is available in 8-pin MSOP case and fits directly onto the...

BTW: Before stepping into above instructions first check the two ferrite beads at pin 5 and pin 8 for proper conductance! It could happen that one of them has degraded,...

> Where could I buy this HM8872 semiconductor, does anybody have any idea? :-) If it were obtainable easily, I wouldn't have worked out a replacement solution like above.

I've put a log output into line 72 of DAPNETNetwork.cpp to see the error code while reading from a broken socket (router rebooted), but there is no negative error code...