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'''If no system is burned in eMMC, then AndroidTool will prompt "Found a MaskROM device"'''
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<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img62.png|600px|]]</div>
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=== '''Method of Burning Android Image to eMMC Based on Ubuntu PC''' ===
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1)First prepare a good quality Type C data cable<br>
2)Then download the upgrade_tool tool and Android 8.1 firmware from the data download page of Orange Pi. The firmware on the official website has two versions: eMMC boot and TF card boot. Here you need to select the eMMC boot version. Note that the firmware that supports eMMC boot does not contain "SD", please make sure the upgrade_tool version is v1.39, please do not use the upgrade_tool software lower than v1.39 to burn the Android 8.1 firmware of Orange Pi 4 LTS, the upgrade_tool tool lower than this version Burning Android 8.1 may be problematic<br>
3)Then execute the command in the terminal to decompress upgrade_tool and add executable permissions
<div style="background:#f1f1f1;border:1px solid #000;">
test@test:~$ '''unzip Linux_Upgrade_Tool_v1.39.zip'''<br>
test@test:~$ '''cd Linux_Upgrade_Tool_v1.39'''<br>
test@test:~/Linux_Upgrade_Tool_v1.39$ '''sudo chmod +x ./upgrade_tool'''
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4)Then start the burning of Android firmware<br>
<p style="padding-left:20px;">
a. First connect the DC power adapter to the OrangePi 4 LTS development board, and make sure to unplug the TF card<br>
b. Then connect OrangePi 4 LTS with Ubuntu PC via Type-C data cable<br>
c. First press and hold the upgrade button of Orange Pi 4 LTS, then lightly press the reset button and release it immediately, wait for 3~5 seconds and then release the upgrade button. The position of the button on the development board is shown in the figure below.
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<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img63.png|600px|]]</div>
a.If the previous steps are successful, the development board has entered the Loader mode at this time, execute the following command and you will see Mode=Loader, indicating that the Loader device has been recognized
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test@test:~/Linux_Upgrade_Tool_v1.39$ ./'''upgrade_tool LD'''<br>
Program Data in /home/csy/.config/upgrade_tool<br>
List of rockusb connected(1)<br>
DevNo=1 Vid=0x2207,Pid=0x330c,LocationID=2010201 '''Mode=Loader'''
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<div style="border:1px solid #000;padding:2px;">
<div style="border:1px solid #000;padding:4px;background:#ffffdc;">
'''If no system is burned in eMMC, then the Maskrom device will be recognized, and the value of Mode will be Maskrom'''
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b.Then copy the downloaded Android image to the Linux_Upgrade_Tool_v1.39 directory<br>
c.Then enter the following command in the terminal of the Ubuntu PC to erase the eMMC<br>
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test@test:~$ '''sudo ./upgrade_tool''' <span style="color:#ff0000">ef</span> '''Orangepi4-lts_Android8.1_v1.0.img'''
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d.Finally execute the following command to start burning Android firmware to eMMC
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test@test:~$ '''sudo ./upgrade_tool''' <span style="color:#ff0000">ef</span> '''Orangepi4-lts_Android8.1_v1.0.img'''
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=== '''How to enter MaskRom mode''' ===
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<div style="border:1px solid #000;padding:4px;background:#ffffdc;">
'''Under normal circumstances, it is not necessary to enter MaskRom mode. Only when the bootloader is damaged and the system cannot be started, it is necessary to enter Maskrom mode for burning.'''
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1)First make sure that the OrangePi 4 LTS development board is disconnected from all power sources, and the SD card is unplugged<br>
2)Then use metal tweezers to connect the two test points in the yellow box in the picture below reserved by the OrangePi 4 LTS development board, and keep it still (<span style="color:#ff0000";>make sure that the two test points are short-circuited</span>)
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img64.png|600px|]]</div>
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3)Then plug in the DC power supply to the Orange Pi 4 LTS development board, wait for 2~3 seconds and then release the metal tweezers. At this point the OrangePi 4 LTS development board will enter maskrom mode<br>
4）Then use the Type C cable to connect the OrangePi 4 LTS development board to the Windows PC, and then open the AndroidTool tool, if all goes well, you can see the AndroidTool interface prompts '''"Found
One MASKROM Device”'''
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img65.png|600px|]]</div>
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5）At this point, you can burn the Android firmware through the AndroidTool tool under Windows
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=== '''Installation instructions of metal heat dissipation shell''' ===
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1)The metal heat dissipation shell kit includes 1 aluminum alloy shell, 3 pieces of thermal conductive silicone, 4 M2x8 screws, 1 screwdriver, and 1 set of external WIFI antenna (optional)
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img66.png|600px|]]</div>
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2)First install the external WiFi antenna to the development board
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img67.png|600px|]]</div>
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3)Then put the development board on the lower shell of the metal heat dissipation shell, pay attention to the alignment of the four screw holes
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img68.png|600px|]]</div>
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4)Tear off the protective stickers on both sides of the 3 pieces of thermally conductive silica gel, and then place 3 pieces of thermally conductive silica gel on the CPU chip and memory chip of the development board, which need to be placed in the corresponding positions as shown in the figure below, pay attention to the missing corners of the thermally conductive silica gel of the CPU chip Side facing 26pin double row pin
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img69.png|600px|]]</div>
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The height of the thermal conductive silica gel at the CPU chip and the memory chip is basically the same, please pay attention to this
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img70.png|600px|]]</div>
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5)Then insert the copper column of the WiFi external antenna into the groove of the upper shell of the metal heat dissipation shell, as shown in the figure below, pay attention to the angle and direction
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img71.png|600px|]]</div>
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6)Then tighten the glue post of the WiFi external antenna to the copper post of the WiFi external antenna, as shown in the figure below
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img72.png|600px|]]</div>
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7)Then align the upper case with the lower case as shown in the figure below, and press down slowly to fasten them together. Note that if the fastening fails, the thermal conductive silicone may be displaced. Readjust the position of the lower thermal conductive silicone, and then try to fasten it again.
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img73.png|600px|]]</div>
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<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img74.png|600px|]]</div>
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8)Finally, let the lower shell of the metal heat dissipation shell face upward, and use a Phillips screwdriver to tighten the 4 screws to the lower shell of the metal heat dissipation shell, and the assembly is completed.
<div style="padding-left:200px;">[[文件:Orange-pi-4-lts-img75.png|600px|]]</div>
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=== '''Start the orange pi development board''' ===
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1) The development board has an onboard eMMC, and the Debian 11 image is burned by default in it. When you get the development board, you can directly use the image in the eMMC for startup and full-function testing.<br>
2) If you need to use the linux image, you can insert the TF card with the linux image burned into the TF card slot of the Orange Pi development board<br>
3) The development board has an HDMI interface, and the development board can be connected to a TV or HDMI display through an HDMI to HDMI cable<br>
4) Connect the USB mouse and keyboard to control the orange pi development board<br>
5) The development board has an Ethernet port, which can be plugged into a network cable for Internet access<br>
6) Connect a 5V/3A (5V/4A can also) high-quality power adapter<br>
<p style="color:#ff0000;padding-left:20px;">
a.Orange Pi 4 LTS cannot be powered through the 5v pin on the 26pin interface<br>
b. Remember not to plug in the 12V power adapter, if the 12V power adapter is plugged in, it will burn out the development board<br>
c. Many unstable phenomena during system startup are basically caused by power supply problems, so a reliable power adapter is very important
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