You just goes into download mode, not safe modeYes.
Try this: with the usb cable plugged in, insert the battery while somehow still holding in down+home and pressing power. As soon as the screen goes black remove the battery.
You need to time this right before the loop starts.
Don't worry about power, the usb power will keep the phome going until you've flashed your new firmware.
Rinse and repeat until you get it to the download mode
EDIT spelling error
meant yes just goes into download mode
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