Update README.md

Author: ayufan

README.md

@@ -1,90 +1,2 @@
 # android-7.1
 Main repository with Android 7.1 releases
-
-## Prepare device for flashing
-
-1. Compile and install `rkflashtool`:
-
-```
-git clone https://github.com/ayufan-rock64/rkflashtool
-make -C rkflashtool
-sudo make -C rkflashtool install
-```
-
-1. Connect USB A-to-A cable to upper USB 2.0 port and your computer,
-
-1. Start Rock64 in Loader mode:
-
-  1. Press and hold Recovery Bt
-  2. Press Reset Btn,
-  3. Stop holding Recovery Btn after 3s.
-  
-  To verify device run:
-  
-  ```bash
-  rkflashtool n
-  ...
-  ```
-  
-  You can also start device in Maskrom mode:
-  1. Shorten eMMC PIN,
-  2. Start device.
-
-1. Download and extract one of the releases (without `-update.zip` at end), ex.: https://github.com/ayufan-rock64/android-7.1/releases/download/0.1.0/android-7.1-rock-64-rk3328_box-v0.1.0-r37.zip,
-
-## Install on Linux/OSX
-
-1. Create a installation script:
-
-```bash
-sudo tee /usr/local/bin/rkinstall <<EOF
-#!/bin/bash
-
-set -xe
-
-rkflashtool P < parameter.txt
-for i in uboot trust misc kernel boot recovery system; do
-    rkflashtool w $i < $i.img
-done
-rkflashtool b
-EOF
-
-sudo chmod +x /usr/local/bin/rkinstall
-```
-
-2. Execute script from within directory:
-
-```bash
-$ rkinstall
-```
-
-## Upgrade on Linux/OSX
-
-1. Create upgrade script
-
-```bash
-sudo tee /usr/local/bin/rkupgrade <<EOF
-#!/bin/bash
-
-set -xe
-
-rkflashtool P < parameter.txt
-for i in uboot trust kernel boot recovery system; do
-    rkflashtool w $i < $i.img
-done
-
-rkflashtool b
-EOF
-
-sudo chmod +x /usr/local/bin/rkupgrade
-```
-
-2. Execute upgrade script from within directory:
-
-```bash
-$ rkupgrade
-```
-
-## Author
-
-Kamil Trzciński, 2017, https://ayufan.eu