help me my htc desire 620g no os and recovery error "no command"

hello
pleas help me

my phone give me notification "we have update his size 9mb only"
im downloaded it and restart

when restart to install the update he go to recovery mode and give "no command"

im try to turn on but give me htc then turn off

information:
old os : andriod 4.4.2
root : no
recovery : android system recovery <3e> 1.14.401.002

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