to make it easier to your hard brain, it should be one of those codes for some smartphones (*#*#3646633#*#* or *#*#54298#*#*) but any other phone that doesn't work with these codes should have its own specific code. the list I am looking for opens access to a few system settings that can be modified.
So, OnePlus disabled access to engineering mode for all OnePlus devices recently. So you'll not be able to access it now via dialing *#808# in dialer. There
Xiaomi Redmi Note 9 Pro Max secret codes, Engineering Mode, hidden functions, GSM codes. Deutsch Secret codes for Xiaomi Redmi Note 9 Pro Max *#06# - IMEI, a
However, the tech menu is still necessary for some users and all phone manufacturers offer free access to it, with the possible exception of Apple's shopping mode. However, you need to know special USSD codes that can be used to open engineering mode in the Xiaomi Redmi 10 5G. Xiaomi Redmi 10 5G special codes and where they can be obtained

Redmi Note 10 Pro 5G secret codes, Engineering Mode, hidden functions, GSM codes. Deutsch Secret codes for Redmi Note 10 Pro 5G *#06# - IMEI (International Mobile

Download the file for Xiaomi Redmi 9 with the code is lancelot. Please make sure the code is exact. You can check model code by command fastboot getvar product in Fastboot mode. This file size is 1.31 GB. Xiaomi Redmi 9 may called with other names like M2004J19G, M2004J19I, M2004J19C.

The last sure-fire way is to simply search the internet. Every code for a particular device has been known for a long time, some of them even before the device was released. All you have to do now is type "code for Xiaomi Redmi Note 5 Pro Menu Engineering" in any search engine.
8bgn.
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    • engineering mode code for redmi