Recovery replaced

Every time I flash cyanogenmod 12.1 on my device, xperia M C1904, I loose my custom recovery, i.e., CWM or TWRP and get reverted back to Cyanogen Recovery and I say to you that this recovery is bad, literally very bad. Nothing ever works with this recovery.

The command am using to flash recovery is:

Quote:

fastboot flash boot boot.img

Thank you in advance. :)

Sent from my C1904 using XDA Free mobile app