Xperia 10 II docomo or docomo-qssi?

[robang74]

I reach the Sony Open Devices program page and found the last open source firmware package:

• https://developer.sony.com/open-source/aosp-on-xperia-open-devices/downloads/open-source-archives#secondary-menu-desktop

In particular this one:

• Open source archive for 59.2.B.0.398 | Developer World

Which contains two folder with similar content:

• seine-1.2.0-docomo
• seine-1.2.0-docomo-qssi

Someone can explain me the difference between the two? Which is the best to try?

UPDATE

Only source code apart these two images:

seine-1.2.0-docomo-qssi/packages/modules/BootPrebuilt/

• 5.4/arm64/boot-userdebug.img
• 5.10/arm64/boot-userdebug.img

but nothing about binary firmware useful for an upgrade of the modem/GPS.

UPDATE #2

At this point, I found enough information to compile a new kernel and its booting image. Does anyone outside Jolla developer circle did a custom boot image before? Because creating a brand-new boot image is the first step to upgrade the kernel.