Now my R4 card is back to life and i'm able to play DQ 4-6, DQ7-8 on my N3DS yay~
System: N3DS 11.2J A9LH/Luma 6.6
NDS card: R4 Upgrade Revolution SDHC carts (www.r4i-sdhc dot com)
replace R4 firmware with DSTT (as it's a clone).
DSTT Launcher works!
working brilliantly! thanks for your hard work.