How to download kernel sources (31.1.0) for Xavier

Hello,
I tried to grab the sources w/ a wget from https://developer.nvidia.com/embedded/dlc/31.1.0 but end w/ a 403. On the browser side a Membership is required. The sources are public ? or I need a special membership ? pls note, I tried also w/ developer access w/o success. Rgds

( Link for references :
Ref1 : https://developer.ridgerun.com/wiki/index.php?title=Xavier/JetPack_4.1/Compiling_Code/Kernel,
Ref2 : https://github.com/davidjun/buildJetsonTX2Kernel/blob/master/scripts/getKernelSourcesNoGUI.sh
)

You may try https://developer.nvidia.com/embedded/dlc/l4t-sources-31-1-0

As part of the JetPack install a script name source_sync.sh will clone all of the publicly released source code. This is convenient because you get all of the git history.

I use the repositories defined in source_sync.sh to create git sub modules (that I mirror locally). I find this to be convenient and powerful. When a new release is available you need only to update to a different tag.