device offline

Hi anton, i upgraded to version 4.2 and everything seems to work fine except 4 trackers which still offline, i have deleted and added them but nothing happens
trackers are from chinese manufactures GT02 with DYTECH protocol, before upgrading, those devices was configured with 5002 port and now i have tested all port numbers that i found on documentation for chinese clones but it still doesn't work
please find below a HEX msg from logs that i kept in backup before upgrading for one device (id : 355227044611101 )

2018-12-13 00:36:15 DEBUG: [A4975F9F: 5002 < 105.141.14.240] HEX: 283032373034343631313130314252303031383132313241333235352e323932304e30303734352e35383339573030302e303233333631343233302e333530303030303030304c303030303030303029
2018-12-13 00:36:15  INFO: [A4975F9F] id: 355227044611101, time: 2018-12-13 00:36:14, lat: 32.92153, lon: -7.75973, speed: 0.0, course: 230.4

hope this may help

any help would be appreciated

Have you checked logs after upgrading? Have you followed troubleshooting?

thanks anton for your reply, yes i checked logs after upgrading and i didn't find recieved data for those trackers, it seems like the server can't communicate with them, as i said before i have deleted and added them by triying different port numbers i have also followed all instructions in troubleshooting section on the website, i have actually 24 online devices on the server that works well

I wonder if the protocol is still supported in this new version ??
previous version : 3.9

Even if protocol is not supported, you need to see HEX data. Follow troubleshooting guide.