Huawei LDN-L21 flash via SD card - Software install failed - Android Q&A, Help & Troubleshooting

Hello,
I want to flash the Huawei LDN-L21 via SD card but whichever version I have download always take the message "Software install failed - Incompatibility with current version - Please download the correct update package". I have download the wrong version or there is no possible to downgrade this smartphone via SD card?
Firmware Version that I have downloaded and didn't work:
"Huawei Honor 7A 2018 ATU-L31 AUM Atomu-L31B 8.0.0.132(C432CUSTC432D2) Firmware Android 8.0.0 EMUI 8.0.0 Greece,Ukraine,Slovakia,Norway,Czech Republic,Cyprus,Poland androidhost.ru"
"Huawei_Y7_Prime_LDN-L21_LDN-L21_8.0.0.166_C185CUSTC185D1_EMUI8.0_05015BFY_Dload_(by_huaweistockrom.com)"
"Huawei Y7 Prime 2018 LDN-L21 hw eu HLRCF London-L21A 8.0.0.150(C432CUSTC432D1) Firmware 8.0.0 r1 EMUI8.0 05015BHV [androidhost.ru]"

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Hello Community, im using Lineage OS 13 (speedo, spirtix's rom) and i wanna turn back to Stock Lollipop. Can anyone help me?
btw im using PLK-L01
Nancy3i8ht said:
Hello Community, im using Lineage OS 13 (speedo, spirtix's rom) and i wanna turn back to Stock Lollipop. Can anyone help me?
btw im using PLK-L01
Click to expand...
Click to collapse
The downgrade process to lollipop might be difficult. You will have to flash any EMUI based marshmallow ROM before it.
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spirtix said:
The downgrade process to lollipop might be difficult. You will have to flash any EMUI based marshmallow ROM before it.
If you're on EMUI marshmallow ROM:
1) Download rollback package here and place UPDATE.APP in dload folder
2) Type *#*#2846579#*#* on dial pad and perform software upgrade from SD card
3) You should be still on marshmallow after this, so download B130 lollipop firmware
4) Place UPDATE.APP into dload folder and perform software upgrade again.
Click to expand...
Click to collapse
Thank you so much! i will try .
spirtix said:
The downgrade process to lollipop might be difficult. You will have to flash any EMUI based marshmallow ROM before it.
If you're on EMUI marshmallow ROM:
1) Download rollback package here and place UPDATE.APP in dload folder
2) Type *#*#2846579#*#* on dial pad and perform software upgrade from SD card
3) You should be still on marshmallow after this, so download B130 lollipop firmware
4) Place UPDATE.APP into dload folder and perform software upgrade again.
Click to expand...
Click to collapse
He is on LOS...??? How to revert to stock rom from LOS?
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rambik33 said:
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Click to expand...
Click to collapse
You mean 8.0.0.385 is the first implementation of GPU turbo feature ? So i cant downgrade below ?
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