Dear XDA,
Today i tried to install custom rom for the first time on my micromax a310 CM 12.1 v2 and as suggested on page i use twrp recovery and after wiping the dalvik, cache,etc. as per this link
http://forum.xda-developers.com/a310…anvas-t3282317
then when i open install there is no access to external sd card where my rom is. unable to anything , spflash tool gives error, ygdp tool start and never stops processing…….any one please help me.