[aftab malvi]

I'm using Lenovo k8 plus xt1902-2. I Successfully unlocked my bootloader using command ''fastboot oem unlock'' and in fastboot mode it says Device Status: unlocked (see attachment) but when i try to flash TWRP i'm getting error 

platform-tools>fastboot flash recovery r
ecovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (14280 KB)...
OKAY [  0.428s]
writing 'recovery'...
FAILED (remote: not allowed in locked state)
finished. total time: 0.445s

Even worse  when i use command ''fastboot getvar all'' to check my bootloader status it says  

(bootloader)    partition-type:preloader: raw data

(bootloader)    serialno: 0123456789ABCDEF

(bootloader)    off-mode-charge: 1

(bootloader)    warranty: yes

(bootloader)    unlocked: no

(bootloader)    efuse: yes

(bootloader)    secure: yes

(bootloader)    kernel: lk

(bootloader)    product: MARINO

(bootloader)    hwid: 0

(bootloader)    version-preloader:

(bootloader)    version: 0.5

all: Done!!
finished. total time: 0.896s

I even tried to lock the bootloader just so that i can start the unlock procedure again, but it just doesn't lock. I tried to flash stock Rom thru Sp flash tool using each and every mode (download load only, firmware upgrade, format all + download) the boot loader just doesn't lock again. 

Please help me with this as i really want to install TWRP and root my device . Thanks!

[X3non]

I'm using Lenovo k8 plus xt1902-2. I Successfully unlocked my bootloader using command ''fastboot oem unlock'' and in fastboot mode it says Device Status: unlocked (see attachment) but when i try to flash TWRP i'm getting error 
...

Please help me with this as i really want to install TWRP and root my device . Thanks!

since you already Have stock rom, flash TWRP recovery + the scatter file from the stock rom using SP flash tool

[aftab malvi]

I'm using Lenovo k8 plus xt1902-2. I Successfully unlocked my bootloader using command ''fastboot oem unlock'' and in fastboot mode it says Device Status: unlocked (see attachment) but when i try to flash TWRP i'm getting error 
...

Please help me with this as i really want to install TWRP and root my device . Thanks!

since you already Have stock rom, flash TWRP recovery + the scatter file from the stock rom using SP flash tool

Actually I've tried that also with no luck, it gives me error STATUS_INSUFFICIENT_BUFFER (0xC0010007)

[X3non]

Actually I've tried that also with no luck, it gives me error STATUS_INSUFFICIENT_BUFFER (0xC0010007)

are you able to flash stock rom successfully without any errors?

[aftab malvi]

Actually I've tried that also with no luck, it gives me error STATUS_INSUFFICIENT_BUFFER (0xC0010007)

are you able to flash stock rom successfully without any errors?

Yes. This is a strange issue I've ever came across. I've unlocked and rooted a no. of devices in the past.

[hovatek]

Actually I've tried that also with no luck, it gives me error STATUS_INSUFFICIENT_BUFFER (0xC0010007)

Can I see a screenshot of this error message

[leibneitz]

I'm using Lenovo k8 plus xt1902-2. I Successfully unlocked my bootloader using command ''fastboot oem unlock'' and in fastboot mode it says Device Status: unlocked (see attachment) but when i try to flash TWRP i'm getting error 

platform-tools>fastboot flash recovery r
ecovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (14280 KB)...
OKAY [  0.428s]
writing 'recovery'...
FAILED (remote: not allowed in locked state)
finished. total time: 0.445s

Even worse  when i use command ''fastboot getvar all'' to check my bootloader status it says  

(bootloader)    partition-type:preloader: raw data

(bootloader)    serialno: 0123456789ABCDEF

(bootloader)    off-mode-charge: 1

(bootloader)    warranty: yes

(bootloader)    unlocked: no

(bootloader)    efuse: yes

(bootloader)    secure: yes

(bootloader)    kernel: lk

(bootloader)    product: MARINO

(bootloader)    hwid: 0

(bootloader)    version-preloader:

(bootloader)    version: 0.5

all: Done!!
finished. total time: 0.896s

I even tried to lock the bootloader just so that i can start the unlock procedure again, but it just doesn't lock. I tried to flash stock Rom thru Sp flash tool using each and every mode (download load only, firmware upgrade, format all + download) the boot loader just doesn't lock again. 

Please help me with this as i really want to install TWRP and root my device . Thanks!

After "fastboot oem unlock" you should provide command "fastboot flashing unlock" to remove flashing restriction.

[aftab malvi]

Actually I've tried that also with no luck, it gives me error STATUS_INSUFFICIENT_BUFFER (0xC0010007)

Can I see a screenshot of this error message

[aftab malvi]

I'm using Lenovo k8 plus xt1902-2. I Successfully unlocked my bootloader using command ''fastboot oem unlock'' and in fastboot mode it says Device Status: unlocked (see attachment) but when i try to flash TWRP i'm getting error 

platform-tools>fastboot flash recovery r
ecovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (14280 KB)...
OKAY [  0.428s]
writing 'recovery'...
FAILED (remote: not allowed in locked state)
finished. total time: 0.445s

Even worse  when i use command ''fastboot getvar all'' to check my bootloader status it says  

(bootloader)    partition-type:preloader: raw data

(bootloader)    serialno: 0123456789ABCDEF

(bootloader)    off-mode-charge: 1

(bootloader)    warranty: yes

(bootloader)    unlocked: no

(bootloader)    efuse: yes

(bootloader)    secure: yes

(bootloader)    kernel: lk

(bootloader)    product: MARINO

(bootloader)    hwid: 0

(bootloader)    version-preloader:

(bootloader)    version: 0.5

all: Done!!
finished. total time: 0.896s

I even tried to lock the bootloader just so that i can start the unlock procedure again, but it just doesn't lock. I tried to flash stock Rom thru Sp flash tool using each and every mode (download load only, firmware upgrade, format all + download) the boot loader just doesn't lock again. 

Please help me with this as i really want to install TWRP and root my device . Thanks!

After "fastboot oem unlock" you should provide command "fastboot flashing unlock" to remove flashing restriction.

Tried this just now, still no luck. :
Mtk devices suck big time really! Never faced any issues with Qualcomm  powered devices, unlocking those devices is a breeze. I've had some bad experiences with Mediatek devices in the past also.

[hovatek]

Tried this just now, still no luck. :
Mtk devices suck big time really! Never faced any issues with Qualcomm  powered devices, unlocking those devices is a breeze. I've had some bad experiences with Mediatek devices in the past also.

Try flashing the stock recovery alone (not custom) and let me know how that goes