Help fastboot oem rebootRUU error

[Desire816]

Hello

I want to flash an entire ROM, but there are problems.

the specifications of my Desire 816 are as follows:


c:\Android>fastboot getvar all
INFOversion: 0.5
INFOversion-bootloader: 3.19.0.0000
INFOversion-baseband: INVALID_VER_INFO
INFOversion-cpld: None
INFOversion-microp: None
INFOversion-main:
INFOversion-misc: XA SHIP S-ON
INFOserialno: 123456789012
INFOimei: 352706061021651
INFOimei2: 352706061021669
INFOmeid: 00000000000000
INFOproduct: a5_dug
INFOplatform: hTCBmsm8226
INFOmodelid: 0P9C70***
INFOcidnum: HTC__J15
INFObattery-status: good
INFObattery-voltage: 0mV
INFOpartition-layout: Generic
INFOsecurity: on
INFObuild-mode: SHIP
INFOboot-mode: FASTBOOT
INFOcommitno-bootloader: 09813c97
INFOhbootpreupdate: 11
INFOgencheckpt: 0
all: Done!


Problems:

1. When I use the command fastboot oem rebootRUU, I receive the following errors:

c:\Android>fastboot oem rebootRUU
INFOError: Command never completed
Error: Command timeout error
Error: Command completed with errors
Failed Reading block @ 524288


1. Why is this?
2. Can this command be used when I have not yet put a rom.zip file in fastboot folder?