atualizar htc desire 820u

[juanpi19838]

hola buenas a todos los compañeros compre por internet el htc desire 820u dual sim viene con kit kat 4.4.4 y deseo actualizarlo aprece una actualizacion la descarga pero no se instala, no lo he modificado no le he instalado nada ni lo he desbloqueado me podrian colaborar para poder actualizarlo gracias

informacion del cel

locked
s-off
a51- dtul
cid 11111111


[rild.libpath]: [/system/vendor/lib/libril-qc-qmi-1.so]
[ro.aa.cidlist]: [HTC__622]
[ro.aa.customizationid]: [873382]
[ro.aa.maincid]: [HTC__622]
[ro.aa.mainsku]: [708]
[ro.aa.modelid]: [0PFJ10000]
[ro.aa.project]: [A51_DTUL_K44_DESIRE_SENSE60]
[ro.aa.report]: [com]
[ro.aa.rid]: [374]
[ro.aa.romver]: [1.14.708.3]
[ro.aa.skulist]: [708]
[ro.aa.taskid]: [398695]
[ro.adb.secure]: [1]
[ro.allow.mock.location]: [0]
[ro.apn.mvno.sort_order]: [1]
[ro.baseband.arch]: [msm]
[ro.baseband]: [01.01.010_U1030433_08.01.41008]
[ro.bc_tmo]: [300]
[ro.bluetooth.remote.autoconnect]: [true]
[ro.bluetooth.request.master]: [true]
[ro.board.platform]: [msm8916]
[ro.boot.baseband]: [01.01.010_U1030433_08.01.41008]
[ro.boot.batt_poweron]: [good_battery]
[ro.boot.bootdevice]: [7824900.sdhci]
[ro.boot.bootloader]: [3.19.0.0000]
[ro.boot.dq]: [FAIL]
[ro.boot.keycaps]: [qwerty]
[ro.boot.mode]: [normal]
[ro.boot.podt]: [0x3E8]
[ro.boot.rom_type]: [NORMAL]
[ro.boot.serialno]: [HC4AZYC07030]
[ro.bootloader]: [3.19.0.0000]
[ro.bootmode]: [normal]
[ro.bt.bdaddr_path]: [/sys/module/htc_bdaddress/parameters/bdaddress]
[ro.bt.ble_tag]: [1]
[ro.build.changelist]: [401930]
[ro.build.characteristics]: [default]
[ro.build.date.utc]: [1414490204]
[ro.build.date]: [二 10月 28 17:56:44 CST 2014]
[ro.build.description]: [1.14.708.3 CL401930 release-keys]
[ro.build.display.id (http://ro.build.display.id)]: [KTU84P release-keys]
[ro.build.fingerprint]: [htc/htc_asia_hk/htc_a51dtul:4.4.4/KTU84P/401930.3:user/release-keys]
[ro.build.host]: [ABM104]
[ro.build.id (http://ro.build.id)]: [KTU84P]
[ro.build.languageremove]: [0]
[ro.build.product]: [htc_a51dtul]
[ro.build.project]: [A51_DTUL_K44_DESIRE_SENSE60:398695]
[ro.build.sense.version]: [6.0]
[ro.build.sku]: [hTC Asia HK CHT]
[ro.build.tags]: [release-keys]
[ro.build.type]: [user]
[ro.build.user]: [buildteam]
[ro.build.version.codename]: [REL]
[ro.build.version.htcsdk]: [HTCExt:HTCExtension_Sense60_443_5;SDK:6.25;hdkbase :19.2]
[ro.build.version.incremental]: [401930.3]
[ro.build.version.release]: [4.4.4]
[ro.build.version.sdk]: [19]
[ro.carrier]: [ALL]
[ro.chk_prd]: [1]
[ro.cid]: [11111111]
[ro.com.android.dataroaming]: [false]
[ro.com.google.clientidbase]: [android-htc-rev]
[ro.com.google.gmsversion]: [4.4_r4]
[ro.config.alarm_alert]: [Alarm_Classic.ogg]
[ro.config.htc.enableCOTA]: [1]
[ro.config.notification_sound]: [pixiedust.ogg]
[ro.config.ringtone]: [Ring_Synth_04.ogg]

[topfire]

Hola, tienes que buscar una ROM de mashmallow del modelo de Asia dual sim y imstalalarla por faatboot.
Tiene echo s-off te cogerá seguro sin problemas.