Software image download error using Alpha XGS-PON with extended message set support

I've found some problems while testing the software download image using Alpha XGS-PON with support for the extended message set.
@Chip help me with a private fix in the attached omci-lib-go -> software.go.
Applying this patch in voltha 2.11, I've noticed the following error at Alpha CLI at the end of software download:

omcid:error:owapi_rut_endSwdl:413:image crc 0xcaf9d029 in end software download does not match with the calculated image crc 0xf6715ee0

@Chip asked me the following for further investigation:

1) Create a binary file that is 4k bytes composed of 00->FF (see image-00-FF.bin).
I've improved openonu logs to print all section data to be sure that the slice contains the true data (rawdump and omci.hex).
I could say that the slice seems to be good, as follows:

. 1st section data: from 00 -> ac
. 2nd section data: from ad -> 59
. last section data: from 5a -> ff (smaller fragment)

Besides that, he asked me to try some tests that I did not started:

2) Set window size t 1 and send every request asking for an ack response

3) Pad the very last frame out, with zeros

Regards,
Marcos