Tou com um problema parecido.
 
	 
 
	executei o comando fastboot -w e o retorno foi esse:
 
	erasing 'userdata'... 
	(bootloader) Failed to erase partition 
	FAILED (remote failure) 
	finished. total time: 0.007s
 
	 
 
	 
 
	aqui está o getvar all:
 
	< waiting for device > 
	(bootloader) version: 0.5 
	(bootloader) version-bootloader: moto-msm8953-C2.12(*) 
	(bootloader) product: sanders 
	(bootloader) board: sanders 
	(bootloader) secure: yes 
	(bootloader) hwrev: P4 
	(bootloader) radio: 4 
	(bootloader) storage-type: emmc 
	(bootloader) emmc: 32GB SAMSUNG RX1BMB RV=08 PV=07 FV=0000000000000007 
	(bootloader) ram: 3GB SAMSUNG LP3 DIE=6Gb M5=01 M6=05 M7=00 M8=7B 
	(bootloader) cpu: MSM8953 
	(bootloader) serialno: d95d906f 
	(bootloader) cid: 0xDEAD 
	(bootloader) channelid: 0x00 
	(bootloader) uid: A4A2D23900000000000000000000 
	(bootloader) securestate: oem_locked 
	(bootloader) iswarrantyvoid: n/a 
	(bootloader) max-download-size: 534773760 
	(bootloader) reason: Last time flashing failed 
	(bootloader) imei: 000000000000000 
	(bootloader) meid: 
	(bootloader) date: 01-01-1970 
	(bootloader) sku: 000000000000000 
	(bootloader) carrier_sku: 
	(bootloader) battid: 
	(bootloader) iccid: 
	(bootloader) cust_md5: 
	(bootloader) max-sparse-size: 268435456 
	(bootloader) current-time: 
	(bootloader) ro.build.fingerprint: 
	(bootloader) poweroffalarm: 0 
	(bootloader) ro.build.version.full: 
	(bootloader) ro.build.version.qcom: 
	(bootloader) version-baseband: 
	(bootloader) kernel.version: 
	(bootloader) sbl1.git: sbl1.git 
	(bootloader) rpm.git: rpm.git 
	(bootloader) tz.git: tz.git 
	(bootloader) devcfg.git: devcfg.git 
	(bootloader) keymaster.git: keymaster.git 
	(bootloader) cmnlib.git: cmnlib.git 
	(bootloader) cmnlib64.git: cmnlib64.git 
	(bootloader) prov.git: prov.git 
	(bootloader) aboot.git: git=MBM-NG-VC2.12-0-g07ff23c 
	(bootloader) frp-state: no protection (err) 
	(bootloader) ro.carrier: 
	(bootloader) current-slot: 
	(bootloader) slot-suffixes: _a 
	(bootloader) slot-count: 1 
	(bootloader) slot-successful:_a: INVALID 
	(bootloader) slot-successful:_b: INVALID 
	(bootloader) slot-bootable:_a: INVALID 
	(bootloader) slot-bootable:_b: INVALID 
	(bootloader) slot-retry-count:_a: unknown 
	(bootloader) slot-retry-count:_b: unknown 
	all: listed above 
	finished. total time: 0.088s