With new fw such like 7.10 or 7.20 doesn't work features activation using xml, but if you apply patch directly to region 140 you will be able to activate desired features.
BTW with fw 7.20 I still have supported_features.html file in HTML folder. Even if I delete it. After Nuvi off/on new file supported_features.html always appears.
I'm not sure where and how but I think you are making mistakes.
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