Growatt old model like -S firmware download
1. Growatt 30000-50000 TL3-S firmware Download ( Common Version)
You need to upgrade 2 firmwares: THAA15xx 20200428pm.hex should be upgraded firstly, then thaa-xx18 20200630.bin finally
2. Shinebus Download
Shinebus Old Version mainly for Growatt 40K TL3-NS, other models can use Shinebus New Version