Dahua DH-SD42212T-HN firmware upgrade issue

Hi,

I have an issue when atempting to upgrade this Dahua PTZ camera.
Actual software version is : 2.400.0000.9.R.4, Build Date: 2016-05-25

I downloaded last firmware 2 files on Dahua website :
DH_SD-Mao-Rhea_Eng_P_Stream3_IVS_V2.600.0000.2.R.20170905.bin
General_SD50XXX-HN-MAIN_MCU_V2.300.0000000.10.R.170926.bin

When I started upgrading with first file,after seconds, I got the 'File unmatch...' error, camera rebooted, the software version was the same and all camera functions stayed...

Dahua DH-SD42212T-HN firmware upgrade issue