Smile Cant access Recovery using Hardware keys Xperia ZL

HI,
Can anyone help me to go to recovery using hardware keys(power button + Vol down or up). I am using Ultimate BlackXZL V2 Rom in Xperia ZL C6502 (India) . My bootloader is locked. Unlock allowed : Yes. Also Using latest SuperSu v1.99. Recovery used is latest XZL lockeddualrecovery2.7.145-BETA. So to load recovery i have to use any apps like rom manager. Because of this while flashing any ROMS, if any error comes am not able to load recovery, making me to flash the stock ftf which i created using flashtool. Please Help.