[Huawei P40 Pro Guides, News, & Discussion] badmania98:
A short history of EMUI firmware versions on P40 Pro C432

( on other phones type or region could be different versions but some how similar)
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10.1.0.121 = The version that can be used to install GMS.

10.1.0.131= The last version that can be used to install GMS.

20123.05.17: I recommend this version, because downgrading to 10.1.0.121 is not possible with HiSuite proxy at this time.

10.1.0.176 = This is the minimum version that you can reach when downgrade from a EMUI11 no higher than 11.0.0.186, using original HiSuite, if you never upgraded to a higher version than EMUI11.0.0.186. Downgrade from this version to a lower version (10.1.0121 or 131) will be done using ”pen-drive+USBC OTG” or ”NM card”.

11.0.0.186 = The last EMUI11 version that allows downgrade to a lower version (no lower than 10.1.0.176) using original HiSuite, if you never upgraded to a higher version than EMUI11.0.0.186. If you upgrade to higher EMUi version than 11.0.0.186, next time when you downgrade it, the phone will loose Fast Charge and transfer data through USB cable from/to computer. To fix this issues you have to upgrade back till the newest version of EMUI11. I suggest you to not upgrade to a newer version than 11.0.0186 and to disable software updates (EMUI), if you never upgraded to a higher version than EMUI11.0.0.186.

11.0.0.193 = It can NOT be downgraded to a lower version with original HiSuite. You can use HiSuite proxy or other method to downgrade to a lower version. After downgrade the phone will loose Fast Charge and transfer data through USB cable from/to computer. To fix this issues you have to upgrade back till the newest version of EMUI11, using OTA (from phone menu) or eRecovery (wifi). In this phone will be 11.0.0.202 or higher.

11.0.0.202 = First EMUI11 that gets back Fast Charge and the transfer data through USB cable from/to computer after downgrade to EMUI10.1 and upgrade (several times) through OTA or eRecovery.

11.0.0.230 = Last firmware version that can be used to downgrade with HiSuite Proxy. It can NOT be downgraded to a lower version with original HiSuite. You can use HiSuite proxy or other method to downgrade to a lower version. After downgrade to EMUI10.1 the phone will loose Fast Charge and the transfer data through USB cable from/to computer. To fix this issues you have to upgrade back till the newest version of EMUI11, using OTA (frrom phone menu) or eRecovery (wifi). In this phone will be 11.0.0.202 or higher.

11.0.0.260 = First firmware that will not allow downgrade to the previous firmwares with HiSuite Proxy. You have to dowgrade first to EMUI11.0.0.230 (or other, no lower than 11.0.0.202) that have USB connection to computer. This first downgrade will be done using ”pen-drive+USBC OTG” or ”NM card”. After that you can use HiSuite proxy or other method to downgrade to EMUI10.1 in one step. After downgrade to EMUI10.1 the phone will loose Fast Charge and the transfer data through USB cable from/to computer. To fix this issues you have to upgrade back till the newest version of EMUI11, using OTA (from phone menu) or eRecovery (wifi). In this phone will be 11.0.0.202 or higher.

12.0.0.218 = First stable EMUi12 firmware. It can be downgrade to 11.0.0.260 using the last version of original HiSuite. If you already installed GMS, on previous EMUI version, before upgrade to EMUI12, it will work.

The transfer files between Computer and phone is available on the downgraded firmware (10.1.x.x) when you use:

a. a certain USB-c to USB-c cable. In this case a UGREEN, US355, USB-C To USB-C, 3.1, Gen.2, PD, 5A, 100W, 4K, 10 Gbps cable has been used. In the same time, using the original USB cable or other ordinary USB-c to USB-C cable have not activated the file transfer. Your computer/laptop should have an USB-C port.

or

b. HarmonyTP cable

Now you can return on first message of the thread and read next ones.

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