@lukass2000
start reading
https://static.tp-link.com/product-overview/2021/202107/20210719/ER605(UN)1.0_Datasheet.pdf
https://static.tp-link.com/upload/product-overview/2022/202201/20220121/ER605(UN)2.0_Datasheet.pdf
biggest thingy seems to be the usb port / 4G LTE backup dongle support ,
it a tad faster has same more memory.
if you are really worried about speed/through put and raw power , the ER7206 is still the better choice but that one doesn't offer the usb dongle 4G lte feature neither
IF I would need to wait for a V2 in favour of the V1 , I would only attach value to the V2 for the backup dongle needs ,