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+# Miscellaneous FAQ
+
+## How do I test my keyboard? :id=testing
+
+Testing your keyboard is usually pretty straightforward. Press every single key and make sure it sends the keys you expect. You can use [QMK Configurator](https://config.qmk.fm/#/test/)'s test mode to check your keyboard, even if it doesn't run QMK.
+
+## Safety Considerations
+
+You probably don't want to "brick" your keyboard, making it impossible
+to rewrite firmware onto it.  Here are some of the parameters to show
+what things are (and likely aren't) too risky.
+
+- If your keyboard map does not include RESET, then, to get into DFU
+  mode, you will need to press the reset button on the PCB, which
+  requires unscrewing the bottom.
+- Messing with tmk_core / common files might make the keyboard
+  inoperable
+- Too large a .hex file is trouble; `make dfu` will erase the block,
+  test the size (oops, wrong order!), which errors out, failing to
+  flash the keyboard, leaving it in DFU mode.
+  - To this end, note that the maximum .hex file size on Planck is
+    7000h (28672 decimal)
+
+```
+Linking: .build/planck_rev4_cbbrowne.elf                                                            [OK]
+Creating load file for Flash: .build/planck_rev4_cbbrowne.hex                                       [OK]
+
+Size after:
+   text    data     bss     dec     hex filename
+      0   22396       0   22396    577c planck_rev4_cbbrowne.hex
+```
+
+  - The above file is of size 22396/577ch, which is less than
+    28672/7000h
+  - As long as you have a suitable alternative .hex file around, you
+    can retry, loading that one
+  - Some of the options you might specify in your keyboard's Makefile
+    consume extra memory; watch out for BOOTMAGIC_ENABLE,
+    MOUSEKEY_ENABLE, EXTRAKEY_ENABLE, CONSOLE_ENABLE, API_SYSEX_ENABLE
+- DFU tools do /not/ allow you to write into the bootloader (unless
+  you throw in extra fruit salad of options), so there is little risk
+  there.
+- EEPROM has around a 100000 write cycle.  You shouldn't rewrite the
+  firmware repeatedly and continually; that'll burn the EEPROM
+  eventually.
+
+## NKRO Doesn't work
+First you have to compile firmware with this build option `NKRO_ENABLE` in **Makefile**.
+
+Try `Magic` **N** command(`LShift+RShift+N` by default) when **NKRO** still doesn't work. You can use this command to toggle between **NKRO** and **6KRO** mode temporarily. In some situations **NKRO** doesn't work you need to switch to **6KRO** mode, in particular when you are in BIOS.
+
+If your firmware built with `BOOTMAGIC_ENABLE` you need to turn its switch on by `BootMagic` **N** command(`Space+N` by default). This setting is stored in EEPROM and kept over power cycles.
+
+https://github.com/tmk/tmk_keyboard#boot-magic-configuration---virtual-dip-switch
+
+
+## TrackPoint Needs Reset Circuit (PS/2 Mouse Support)
+Without reset circuit you will have inconsistent result due to improper initialize of the hardware. See circuit schematic of TPM754.
+
+- http://geekhack.org/index.php?topic=50176.msg1127447#msg1127447
+- http://www.mikrocontroller.net/attachment/52583/tpm754.pdf
+
+
+## Can't Read Column of Matrix Beyond 16
+Use `1UL<<16` instead of `1<<16` in `read_cols()` in [matrix.h] when your columns goes beyond 16.
+
+In C `1` means one of [int] type which is [16 bit] in case of AVR so you can't shift left more than 15. You will get unexpected zero when you say `1<<16`. You have to use [unsigned long] type with `1UL`.
+
+http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279
+
+## Special Extra Key Doesn't Work (System, Audio Control Keys)
+You need to define `EXTRAKEY_ENABLE` in `rules.mk` to use them in QMK.
+
+```
+EXTRAKEY_ENABLE = yes          # Audio control and System control
+```
+
+## Wakeup from Sleep Doesn't Work
+
+In Windows check `Allow this device to wake the computer` setting in Power **Management property** tab of **Device Manager**. Also check BIOS setting.
+
+Pressing any key during sleep should wake host.
+
+## Using Arduino?
+
+**Note that Arduino pin naming is different from actual chip.** For example, Arduino pin `D0` is not `PD0`. Check circuit with its schematics yourself.
+
+- http://arduino.cc/en/uploads/Main/arduino-leonardo-schematic_3b.pdf
+- http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
+
+Arduino Leonardo and micro have **ATMega32U4** and can be used for TMK, though Arduino bootloader may be a problem.
+
+## Enabling JTAG
+
+By default, the JTAG debugging interface is disabled as soon as the keyboard starts up. JTAG-capable MCUs come from the factory with the `JTAGEN` fuse set, and it takes over certain pins of the MCU that the board may be using for the switch matrix, LEDs, etc.
+
+If you would like to keep JTAG enabled, just add the following to your `config.h`:
+
+```c
+#define NO_JTAG_DISABLE
+```
+
+## USB 3 Compatibility
+I heard some people have a problem with USB 3 port, try USB 2 port.
+
+
+## Mac Compatibility
+### OS X 10.11 and Hub
+https://geekhack.org/index.php?topic=14290.msg1884034#msg1884034
+
+
+## Problem on BIOS (UEFI)/Resume (Sleep & Wake)/Power Cycles
+Some people reported their keyboard stops working on BIOS and/or after resume(power cycles).
+
+As of now root of its cause is not clear but some build options seem to be related. In Makefile try to disable those options like `CONSOLE_ENABLE`, `NKRO_ENABLE`, `SLEEP_LED_ENABLE` and/or others.
+
+https://github.com/tmk/tmk_keyboard/issues/266
+https://geekhack.org/index.php?topic=41989.msg1967778#msg1967778