[Keyboard] update boot-mode method for EVE Meteor docs (#10453)

keyboards/eve/meteor/readme.md

@@ -16,6 +16,8 @@ Flashing example for this keyboard ([after setting up the bootloadHID flashing e
 
 **Reset Key:** Short the two holes labeled `FW_JP` underneath the PCB, beside the Tab key while plugging in the keyboard. 
 
-Do not confuse this with the LED holes of the switch in the `Tab` position. `FW_JP` is not reachable from the top as the plate blocks access to it. 
+Do not confuse this with the LED holes of the switch in the `Tab` position. `FW_JP` is not reachable from the top as the plate blocks access to it.
+
+If your PCB does not have this circuit exposed, you must hold down the key corresponding to pins A0 and B0 on the MCU. On at least the red EVE PCB, this is the **+/= key** (second row, 13th column).
 
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