Inverter Connecting but producing error, no activity on MQTT side

[Xnyle]

From the logs
[2024-12-06T13:17:48.333Z] [INFO] Attempting to reconnect to MQTT broker
[2024-12-06T13:17:51.405Z] [INFO] Attempting to reconnect to MQTT broker
[2024-12-06T13:17:54.481Z] [INFO] Attempting to reconnect to MQTT broker
[2024-12-06T13:17:54.531Z] [INFO] Connected to MQTT broker
[2024-12-06T13:59:57.982Z] [INFO] New connection from ::ffff:192.168.66.212
[2024-12-06T13:59:58.000Z] [ERROR] Error while parsing packet from ::ffff:192.168.66.212 Error: Invalid header magic: 22
at Protocol.parseHeader (/app/src/Protocol.js:20:19)
at Protocol.parsePacket (/app/src/Protocol.js:56:33)
at Socket. (/app/src/DummyCloud.js:35:41)
at Socket.emit (node:events:524:28)
at addChunk (node:internal/streams/readable:561:12)
at readableAddChunkPushByteMode (node:internal/streams/readable:512:3)
at Readable.push (node:internal/streams/readable:392:5)
at TCP.onStreamRead (node:internal/stream_base_commons:189:23)

Inverter is Sun800G3
MW3_SSL_5408_1.0B

[Xnyle]

Trace gives this packet

[2024-12-06T14:22:36.101Z] [TRACE] 2024-12-06T14:22:36.101Z Data ::ffff:192.168.66.212: 160303007f0100007b03032ffc7667ece59481e6fb592412be93db7878e635340d8ab44ac65ab152d8f92f000036006bc00ac0140039c02bc02f009ec023c0270067c009c0130033003d0035c00fc005009c003c002fc031c029c00ec02dc025c00400ff0100001c000a000400020017000d0006000404030401000b0002010000230000

[Xnyle]

OK, it's because of new SSL firmware. MW3_SSL_5408_1.0B

I tried to downgrade to 2.06 and also 1.57, i can upload the new FW, but it seems inverter refusing to install old FW on MW3_SSL_5408_1.0B.

Has anyone been able to downgrade from that version?