Thank you very much for your detailed tutorial! I think I'll try it as well, just hope I won't fry my Jolla C in the process

Could you please point me to it? If you mean the maxbhi site, it is sold out and judging from the 0% fulfillment ratio and fake reviews from 2014 (Intex Aqua Fish was released in the summer of 2016 and all the reviews are dated earlier), it looks like it never was available.