I found a JMGO R1 mobile phone. During the experience, I deleted the magisk installed on the machine. As a result, the machine was stuck in recovery and could not move 
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There is only one Mi Pad 67W charging cable (Typec port) on hand. According to the 9008 short circuit principle, the outer skin of the charging cable is peeled off, and the self-made engineering cable is used to flash the machine. 9008 principle and method reference: https://www.bilibili.com/video/BV1C54y197k7?from=search&seid=15158559566331287588&spm_id_from=333.337.0.0 The
main principle is this picture:
from this dismantling article (https://baijiahao.baidu. com/s?id=1684314296846075102&wfr=spider&for=pc), the red and transparent wire cores are power supply wires, the white and green wire cores are data wires, and the yellow wire cores are CC wires, so what needs to be shorted here is the transparent wire and the green wire 
( I shorted two transparent wires and one green wire together).
Then download the wire brush package https://www.cnroms.com/firmwares/smartisan/R1/download/9166, and then download the QPST.2.7.460 toolkit (https://download.csdn.net/download/AJian759447583/80951784 ), download the "Qualcomm full series drivers compatible with all windows systems" driver package (https://download.csdn.net/download/AJian759447583/80952253), install them separately, everything is ready, and start flashing below.
First, win10 restarts, to disable the driver signature, method: Windows Settings –> Update and Security –> Recovery –> Advanced Startup –> Restart Now –> Troubleshooting –> Advanced Options –> Startup Settings –> Restart –> Disable Driver Program signature
As for the BitLocker key, it depends on the version of the operating system. My operating system crashes immediately after opening it, so I don’t care about it. Reference: https://felixxiong.github.io/2020/03/04/% E5%9D%9A%E6%9E%9CR1%E7%9A%84Root%E6%B3%A8%E6%84%8F%E7%82%B9/
Unzip the wire brush package and put it in a directory with no spaces and no Chinese characters. Since it is necessary to download and flash the machine immediately when QFIL detects the 9008 port information, set the QFIL information here first (after trying many times, I found that I shorted it first and then set the QFIL information to flash the machine, and various errors were reported, but if QFIL just detected the 9008 port, click Download flashing is normal, the reason is unknown!)
Open QFIL, Configuration->FireHouse Configuration->Device Type: UFS,
in the main interface, Build Type: Flat Build, Programmer Path select prog_firehose_ddr.elf in the wire brush package just decompressed, Load XML select rawprogram0.xml, patch0.xml 
The software is ready, and then start shorting. After the mobile phone Power off is completely turned off, plug in the unshorted data cable, then short the two transparent lines and the green line, press and hold the phone volume + and power button until the screen is completely off (about 15 to 20s) and then release it, and then Disconnect the short circuit and let the data line return to normal. When QFIL detects the device on port 9008, click the download button immediately to start flashing!
When the word download succeed appears, the flashing is complete, press and hold the power button to turn on the device. At this time, if the loop is stuck in fastboot mode or prompts device has failed verification, then find the del-flash.bat file in the online flash package, short-circuit it to port 9008 again, and run this file.
Wait for a while, the operation is completed, and the phone will automatically turn on:
enter the system after turning on:
