[TCL 20 Pro 5G] o.class.jav:
(I can not take credit for this, copied from their site- however) see links for official flashing tools & directions and here are complete firmware links to official firmware:​

FIRMWARE

Ottawa 3CI1.tctbin (9.1G) - (Android 11)

https://drive.google.com/uc?id=1J3zggbcb2ZLLsYEE9ktK6dEM4DyOVHEd&export=download

5E2Y_DPP5.tctbin (7.5G) - (Android 12)

Google Drive - Virus scan warning

drive.google.com

TOOLS

Android_USB_Driver_Q_9.16.1.28_2016_04_01_All_in_One_Setup.rar

T810_Model_DLL_Setup_v0.0.3.msi

TPST_Frame setup V1.8.0.msi

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TPST Tool User Guide​

Catalog

TPST Tool User Guide 1

1. Introduction 1

1.1 Purpose 1

1.2 Intro 1

2. Install 1

2.1 Install USB Driver 1

2.2 Install TPST 4

2.3 Install model 6

3. Steps to Flash Software 8

3.1 Run TPST 8

3.2 Refurbish the software ( Refurbish function will erase user data) 9

1. Introduction

1.1 Purpose​

This user guide describes the operations of upgrade functions about TPST.

Please trust all warnings from antivirus software if any.

1.2 Intro​

TPST is applied to equipment management system on PC application terminal, and take charge of connecting mobile phone terminal equipment to do software updating.

2. Install​

Before upgrade, please prepare the following tools

Android_USB_Driver_Q_9.16.1.28_2016_04_01_All_in_One_Setup.rar

T810_Model_DLL_Setup_v0.0.3.msi

TPST_Frame setup V1.8.0.msi

2.1 Install USB Driver​

(1) Download, Unzip and open the Driver : Android_USB_Driver_Q_9.16.1.28_2016_04_01_All_in_One_Setup.rar: https://drive.google.com/file/d/1BvhOiiKwJf5MXHyHl2YIK5jvHXRMvpjb/view?usp=sharing

(2) Operates as follows:

2.2 Install TPST​

(1) download the TPST_Frame setup V1.8.0.msi to local:

https://drive.google.com/file/d/1NQD-ByfddHMbzYJrwXGBkXCR7FP2yWyd/view?usp=sharing

(2 )Open the TPST_Frame setup V1.8. 0.msi and operates as follows:

(3) All the installation files and logs are record in the path C:\Program Files (x86)\TCT\TPST\Tool.

2.3 Install model​

(1) Open the T810_Model_DLL_Setup_v0.0.3.msi:

https://drive.google.com/file/d/1fzjdoDJGKxtM2kTrEl3WPFj9tSgexGS3/view?usp=sharing

(2 )Operates as follows:

(3) All the T810 model information are stored in the path C:\Program Files (x86)\TCT\TPST\Model\T810

3. Steps to Flash Software​

3.1 Run TPST​

(1) Click windows “Start” button to enter start menu, and then find TPST shortcut as below figure, or open the TPST in desktop screen.

(2) Click “Load ” menu and select the mode T810 to load it, ex Figure1

Figure 1

Refurbish the software ( Refurbish function will erase user data)​

Power off device. Switch to Download mode(made Device in power off status, long press Vol + and Vol – at same time and plug USB cable, when See warning screen, loose Vol- to switch to download mode) Tool will detect the COM port.

Click “Refurbish” button in the TPST tool to enter the feature. Then click “Browse” button, it will pop up a window, you can select a SW file to download.

In the “Select Software image file” screen, you can view catalog items on the left ,click the file you want to download, then click “OK” button, the file will be selected.

Select “XML LOG”, it can print a log file when you flash the software. Click “Browse” You can select a new xml log directory to save it.

(5)Click “Start Refurbish” button

(6)Wait a few minutes, you can see as follows, Download success.

Note：TPST to support download SW to multiple devices at same time， Suggested connect less than 7 devices to download at same time.