dreamshell bios flasher cannot detect bios chip

[chth96]

Thank you very much for reply.
I tried to melting more solder in order to strongly join original bios and new bios(MX29LV160TMC-90).
But...While soldering..I mistakely broke pin 12 of MX29LV160TMC-90
https://ibb.co/x6GdkmK

I think that there is no hope to revive pin 12 of MX29LV160TMC-90,so I desoldered new bios(MX29LV160TMC-90)..And to make it worse... dreamcast is unable to boot off anymore...
I fiddle with soldering iron and solderwick for 5 hours in order to correctly solder original bios, I narrowly fix the problem of unable to boot off by desoldering remnant solder which join adjacent pin in the back side (gap of pin and origianl bios is too narrow, It was extremely very very hard to desoldering remnant solder from back side)
hah...dual Bios mod is very difficult for soldering novice like me...