Thanks a lot! Thanks to your help, i managed to unlock my T470s. Although i know about the very useful help section, here some notes for others who might want to try the method as well (sorry for redundancy to other comments and instructions):
* the whole process is perfectly described here: https://www.youtube.com/watch?v=1ypCYSxbxyY
* i used a 9$ CH314a programmer with the 3V fix (see https://www.youtube.com/watch?v=HwnzzF645hA)
* in-circuit flashing didn't work for me, so unsoldering seems to be mandatory for T470s
* i found that i needed to erase my BIOS chip in order to get the write to work properly. Just as you already mentioned: ALSWAYS VERIFY the written chip
* as addition to some forum questions: my T470s has W25Q128JV chips and does NOT need an 1,8V adapter. please check individually for your specific flash chip (e.g. at mouser.com)
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