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Lesson #1: Rx, Tx, Gnd terms explanation

There is an interface to connect different devices with name "serial" (different terms may be used for this interface such as UART, COM port and probably something else).
Many mobile phones use "COM port" interface for flash, unlock and other operations.
Three wires should be used to connect Box to Phone:
1. Rx (receive data)
2. Tx (transmit data)
3. Gnd (ground, common wire).

If you want to connect Box to Phone you must connect wires this way:
1. Box Rx (receive) should be connected to phone Tx (transmit), so Box can receive data that was sent by Phone
2. Box Tx (transmit) should be connected to phone Rx (receive), so Phone can receive data that was sent by Box
3. Box Gnd should be connected to phone Gnd (common wire)

As you can see, word "Rx" and word "Tx" is just a words without any reasonable meaning. When you mention Rx or Tx you must specify what device is owner of Rx or Tx.
For example, you can say "I connected Box Rx ..." (device is Box) or "I disconnected Phone Tx ..." (device is Phone) but you can not say "I connected Rx ..." (no device mentioned).