Wishing you luck. Dell was little help, saying it was hardware, but i seem to recall, a few years ago someone had figured out a way to do it. Maybe you could find it still on Dell forums: https://www.dell.com/community/en/conversations/search?q=rst
https://www.dell.com/community/en/conversations/inspiron/turning-off-rst-on-my-inspirion-7490/647f8bb5f4ccf8a8debd96c4?keyword=rst%20linux (the workaround, over 3 years old now, is 3 or 4 pages in)
Really put me, and a lot of others off Dell.