confused 'bout different Versions of WGR614

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26.6at47
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confused 'bout different Versions of WGR614

I just bought a WGR 614(no 'L') in germany. Now I realized that it may possible to change the firmware to open source. But already I'm very confused 'bout these different types of WGR 614x.

How to find out what sort of 614 mine would be? Would it be possible to upgrade safely?