Hi! i took bios from here  https://forum.bits.media/index.php?/topic/38510-eth-xmrтаймингиrx470480570580-оптимизированные-тайминги-и-конфиги-под-майнеры/
Hynix.
there are 3 types of timings there

#1. core/mem 1167/1980-2070. ETH=28.5-29.4 MH/s.
777000000000000022C39C00AC595A3D90550F12B84C8408004006007E0514206A8900A00200312 0100F292F94273116

#1а  core/mem 1167/2050-2150.
999000000000000022C39C00AC595A3D90550F123CCF530C004006007E0514206A8900A00200312 0100F292F94273116
 
#2 core/mem 1167/1880-2040. 28-29,4.
777000000000000022339D00AC595A3D90550F1230CB440900600600740114206A8900A00200312 0150F292F94273116

my card MSI rx470 armor oc 8gb hynix works with only #1a. copy it to strap 1750 and to all after it
core 1166 mem 1900. if i set mem clock higher incorrect shares appears too often and after few minutes card is down
result is 27,2 mh

i want to try one more experiment with timings. if i will get better result - i will share it here

could you give me original bios of this card? mail to misterrazdva@gmail.com  if you have it. please

Спасибо. Выручил. ващдоги по недемократичным ценам продают
а разве в void setup не надо было добавить ещё и pinMode(ResetPin, OUTPUT);