所以我最近继承了一个通过的相对的诺基亚2.1。我不知道PIN码，也不知道我知道Google凭据04EEDED。
当我进入恢复时，FastBoot模式无法选择，并在另一个文本中与红色文本进行比较。我确实可以让adb识别侧面加载模式中的设备，但是当我尝试闪烁的股票和谐rom时，我下载它给了我错误消息："签名验证失败（错误21）" 。
。。所以我无法出于某种原因进入FastBoot，因此我不能使用FastBoot来闪存TWRP，然后闪烁我的ROM，而且由于验证错误，我无法使用Sideload来闪烁。
我需要做些什么，以便能够闪光/ a股票rom并再次运行这款手机？
感谢
So I recently inherited a Nokia 2.1 from a relative who passed. I don't know the pin code, nor do I know the Google credentials 0needed.
When I enter recovery, Fastboot mode is not selectable and is in red text comparet to the other text. I did manage to get ADB to recognize the device in sideload mode, but when I try flashing the stock Android rom i downloaded it gives me the error message: "Signature verification failed (Error 21)".
So I can't enter Fastboot for some reason, so I can't use Fastboot to flash TWRP and after that flash my ROM, and I can't use sideload to flash because of a sinature verification error.
What do I need to do to be able to flash TWRP/a stock ROM and get this phone running again?
Thanks
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