RNE-L21 Not support
 

Before detection Huawei Android phones, enable 'Manufacture' mode:
in dial pad type *#*#2846579#*#* for Qualcomm and Kirin based models, or *#*#14789632#*#* for MTK, then select
'ProjectMenu',
'Background settings',
'USB ports settings',
'Manufacture mode'.

Step by step guide for other Huawei phone unlock:
https://www.dc-unlocker.com/huawei_p...lock_tutorials

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DC - Unlocker 2 Client 1.00.1403

Detecting phone :

selection :
manufacturer - Huawei phones
model - Auto detect (recommended)

Found Phone : RNE-L21
Model : Huawei phone in fastboot mode
IMEI : 869676030815937
Serial NR. : FFY5T18403042302
Firmware : RNE-L21 8.0.0.340(C185

IMEI1:869676030847948
MEID:00000000000000
FB LockState: LOCKED
USER LockState: LOCKED
locked
Battery state: 3787mv

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Factory reset protection Erase start

unknown error (398)

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This means that current version of android in your device has new security patch and is not supported yet.

mr Namelocked when update come for the new security??????

There is no information available about it.