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Firefox升级到115 esr后经常遇到切换回firefox窗口时部分网页白屏，移动鼠标才恢复正常，原来firefox 110启用了gpu sandbox功能，和sandboxie冲突导致出现白屏的问题，关闭firefox的gpu沙盒即恢复正常，firefox about:config修改：

security.sandbox.gpu.level = 0

开启telnet/ssh后登入查看mtd分区信息：

cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 08000000 00020000 "spi0.1"
mtd1: 00100000 00020000 "BL2"
mtd2: 00040000 00020000 "Nvram"
mtd3: 00040000 00020000 "Bdata"
mtd4: 00200000 00020000 "Factory"
mtd5: 00200000 00020000 "FIP"
mtd6: 00040000 00020000 "crash"
mtd7: 00040000 00020000 "crash_log"
mtd8: 01e00000 00020000 "ubi"
mtd9: 01e00000 00020000 "ubi1"
mtd10: 03200000 00020000 "overlay"

备份固件并使用scp或sftp下载：

dd if=/dev/mtd0 of=/tmp/mtd0_spi0.bin
dd if=/dev/mtd1 of=/tmp/mtd1_BL2.bin
dd if=/dev/mtd2 of=/tmp/mtd2_Nvram.bin
dd if=/dev/mtd3 of=/tmp/mtd3_Bdata.bin
dd if=/dev/mtd4 of=/tmp/mtd4_Factory.bin
dd if=/dev/mtd5 of=/tmp/mtd5_FIP.bin

刷入uboot：

#验证md5
md5sum mt7986_redmi_ax6000-fip-fixed-parts-multi-layout.bin 
#写入uboot
mtd write mt7986_redmi_ax6000-fip-fixed-parts-multi-layout.bin FIP
#再校验下是否完整
mtd verify mt7986_redmi_ax6000-fip-fixed-parts-multi-layout.bin FIP

断电按reset按钮启动设置固定ip段192.168.31.x，通过web刷入编译的immortalwrt固件。

后续相同固件在immortalwrt系统内通过sysupgrade升级：

编译环境：

apt install gcc g++ binutils patch bzip2 flex bison make autoconf gettext texinfo unzip sharutils subversion libncurses5-dev ncurses-term zlib1g-dev gawk

使用普通用户编译，编译成功的文件位于bin/target目录下。

useradd -m -s /bin/bash openwrt
su -l openwrt
git clone --single-branch --depth=1 https://github.com/hanwckf/immortalwrt-mt798x.git
cd immortalwrt-mt798x
./scripts/feeds update -a
./scripts/feeds install -a
cp defconfig/mt7986-ax6000.config .config
#t7
#cp defconfig/mt7981-ax3000.config .config
make menuconfig
make -j 2

远程更新后本地更新并二次编译：

git pull
./scripts/feeds update -a
./scripts/feeds install -a
#有增减base system内置命令需clean
make clean
make -j 2

替换iproute2及添加mdns-repeater：

cd
git clone --single-branch --depth=1 https://github.com/immortalwrt/immortalwrt.git
git clone --single-branch --depth=1 https://github.com/immortalwrt/packages.git
mv immortalwrt-mt798x/package/network/utils/iproute2 ./
mv immortalwrt/package/network/utils/iproute2 immortalwrt-mt798x/package/network/utils/
mv packages/net/mdns-repeater immortalwrt-mt798x/package/network/