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A power LED that strobes the whole time, with no COM port at all, is usually the 3.3V regulator hiccuping on a short, not a dead USB stack. Pull the display and measure 3V3 to GND. If it pulses instead of sitting near 3.3V, something on that rail is still shorted (touch controller, a lifted pad from that resistor swap, or the LDO). Two resistors side by side is not a normal factory pattern on these boards, and putting a part back does not reconnect a torn pad. If 3V3 is steady and holding BOOT while you tap RST still never shows a VID, the USB side is dead.

The LED flashing may be just the charging IC trying to inform you that no battery is connected.