[Android Q&A, Help & Troubleshooting] profesor.asix:
I found a LG K120 (LG Spree in US,LG K4 in Europe), after wiping it, in the setup process it asks me for the previous google acount (FRP).

After searching a lot of this model, none of the bypass google account solutions are valid.

I am trying now reinstalling the whole operating system via fastboot, but as the model is very new, there is no implementation (or at least, I'm not able to find it).

The only solution that comes to me is to wipe the frp partion, in HTC is located in /dev/block/bootdevice/by-name/frp, but I don't know which of the listed below is related with frp.

#fastboot getvar all

(bootloader) max-download-size: 0x8000000
(bootloader) partition-size:flashinfo: 1000000
(bootloader) partition-type:flashinfo: raw data
(bootloader) partition-size:userdata: 32000000
(bootloader) partition-type:userdata: ext4
(bootloader) partition-size:cache: c800000
(bootloader) partition-type:cache: ext4
(bootloader) partition-size:system: 9a000000
(bootloader) partition-type:system: ext4
(bootloader) partition-size:nvdata: 2100000
(bootloader) partition-type:nvdata: ext4
(bootloader) partition-size:efuse: 80000
(bootloader) partition-type:efuse: raw data
(bootloader) partition-size:persist: 3000000
(bootloader) partition-type:persist: ext4
(bootloader) partition-size:factory: 1400000
(bootloader) partition-type:factory: raw data
(bootloader) partition-size:rct: 100000
(bootloader) partition-type:rct: raw data
(bootloader) partition-size:cust: 6400000
(bootloader) partition-type:cust: raw data
(bootloader) partition-size:lgfota: a00000
(bootloader) partition-type:lgfota: raw data
(bootloader) partition-size:persistent: 200000
(bootloader) partition-type:persistent: raw data
(bootloader) partition-size:mpt: 1600000
(bootloader) partition-type:mpt: raw data
(bootloader) partition-size:persist_lg: 800000
(bootloader) partition-type:persist_lg: raw data
(bootloader) partition-size:encrypt: 80000
(bootloader) partition-type:encrypt: raw data
(bootloader) partition-size:eksst: 80000
(bootloader) partition-type:eksst: raw data
(bootloader) partition-size:tee2: 500000
(bootloader) partition-type:tee2: raw data
(bootloader) partition-size:tee1: 500000
(bootloader) partition-type:tee1: raw data
(bootloader) partition-size:keystore: 800000
(bootloader) partition-type:keystore: raw data
(bootloader) partition-size:secro: 600000
(bootloader) partition-type:secro: raw data
(bootloader) partition-size:oemkeystore: 200000
(bootloader) partition-type:oemkeystore: raw data
(bootloader) partition-size:seccfg: 80000
(bootloader) partition-type:seccfg: raw data
(bootloader) partition-size:expdb: a00000
(bootloader) partition-type:expdb: raw data
(bootloader) partition-size:lo_bak_go: 800000
(bootloader) partition-type:lo_bak_go: raw data
(bootloader) partition-size:logo: 800000
(bootloader) partition-type:logo: raw data
(bootloader) partition-size:recovery: 1000000
(bootloader) partition-type:recovery: raw data
(bootloader) partition-size:boot: 1000000
(bootloader) partition-type:boot: raw data
(bootloader) partition-size:para: 80000
(bootloader) partition-type:para: raw data
(bootloader) partition-size:laf: 1000000
(bootloader) partition-type:laf: raw data
(bootloader) partition-size:lkbak: 80000
(bootloader) partition-type:lkbak: raw data
(bootloader) partition-size:lk: 80000
(bootloader) partition-type:lk: raw data
(bootloader) partition-size:protect2: a00000
(bootloader) partition-type:protect2: ext4
(bootloader) partition-size:protect1: a00000
(bootloader) partition-type:protect1: ext4
(bootloader) partition-size:nvram: 500000
(bootloader) partition-type:nvram: raw data
(bootloader) partition-size:ftm: 800000
(bootloader) partition-type:ftm: raw data
(bootloader) partition-size:misc2: 800000
(bootloader) partition-type:misc2: raw data
(bootloader) partition-size:proinfo: 300000
(bootloader) partition-type:proinfo: raw data
(bootloader) partition-size:preloader: 40000
(bootloader) partition-type:preloader: raw data
(bootloader) warranty: no
(bootloader) unlocked: yes
(bootloader) secure: no
(bootloader) kernel: lk
(bootloader) product: MUSE6735M_E1LTE_L
(bootloader) version: 0.5
all: Done!!
finished. total time: 0.013s

¿Can anyone give me an idea?

Another problem than I am facing is when trying to erase a partition y get the following.

# fastboot erase cache
******** Did you mean to fastboot format this partition?
erasing 'cache'...
FAILED (remote: unknown command)
finished. total time: 0.002s

And the same answer with many other commands, it seems that LG has implemented a very reduced set of fastboot protocol commands.

To overcome this, flashing the partition with zero's file can do de job, that is my guess.

Thanks for your help.