Help! My zenfone 2 NOT leaves the fastboot screen

When trying to downgrade to android L ( after installing android M ) first took a Wipe Cache / Data and he called normal, then tried to get back into recovery mode, but it just does not come out the fastboot mode , and not back starting Android M, it only accesses the fastboot screen.
Already I tried to install the TWRP , and also not install . What can I do?

I thank all who help . :crying:

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