Im glad you started this thread although there is already for sunsynk which in my opinion is identical in main firmware, only HMI will vary, so I could track if there is an update.
I'm a guy that if there is a firmware update, then it literally means there is an update to atleast improvement if not fix. Some people are "aint broke aint fix". But for me, I wont wait to encounter the problem that a firmware update made to fix that "not yet encountered problem".
Before, the only way you could update is thru distributors. I once had this funny experience from a distributor that I requested an update and told me "dont, its just a change in version numbers" . Hey, he is not wrong, we dont get documentation, so we assume its just changes in versioning according to that distributor. That was when the 9.9a clipping issue for 5kW. I insisted, so it fixed the 9.9a clipping and he is now using it to promote sales.