mtd upgrade 5.2.5

Hello, i've one DS-2CD2532F-IWS and one DS-2CD2432F-IW. They came with 5.3.0 on the sticker from aliexpress. After a brick i success to downgrade them with the MTD hack to 5.2.5. I tried to upgrade the DS-2CD2432F-IW with differents firmware with no success. Is it possible and if yes, how can i...