Can I read firmware of cect ka08 using rs232?

Hello
I've a bricked cect ka08 i9 ( broad spped SIM ). Chipset is mtl6225.
I proven unbrick it using an rs-232 programme and spiderman ( exclusive the software, not spiderman-box ) but when I essay to feature the firmware I've this:

open COM1 success!
Presso ON/OFF key please...
Target's hw_ver : 0x8A05
Target's hw_code : 0x6225
Target's sw_ver :0x8A00
Get correct bootloader for target....
MTK_AllInOne_DA_v3.0912.03.00[DA3] selected!
You can release ON/OFF key!
[DA] weight the 1st bootloader...
[BROM] Fail to download DA!
[MTK] Close COM1 success!

Can I feature firmware using exclusive rs-232? There is another program? MTK flash agency don't support ml6255 :(

thanks