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Well as I got the last issue sorted out, I wanted to finally try the Viki I bought months ago now that there is a firmware listed for it.

However, as I tried to upload it in Arduino, I got this error message:

Arduino: 1.5.5-r2 (Windows 8), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

In file included from ultralcd.cpp:41:
ultralcd_implementation_hitachi_HD44780.h:172: error: 'LiquidTWI2' does not name a type
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_set_custom_characters()':
ultralcd_implementation_hitachi_HD44780.h:366: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_init()':
ultralcd_implementation_hitachi_HD44780.h:391: error: 'lcd' was not declared in this scope
ultralcd_implementation_hitachi_HD44780.h:391: error: 'LTI_TYPE_MCP23017' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_clear()':
ultralcd_implementation_hitachi_HD44780.h:417: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_printPGM(const char*)':
ultralcd_implementation_hitachi_HD44780.h:425: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_status_screen()':
ultralcd_implementation_hitachi_HD44780.h:485: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_generic(uint8_t, const char*, char, char)':
ultralcd_implementation_hitachi_HD44780.h:633: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_setting_edit_generic(uint8_t, const char*, char, char*)':
ultralcd_implementation_hitachi_HD44780.h:655: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_setting_edit_generic_P(uint8_t, const char*, char, const char*)':
ultralcd_implementation_hitachi_HD44780.h:677: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawedit(const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:732: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sdfile_selected(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:746: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sdfile(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:766: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sddirectory_selected(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:786: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_drawmenu_sddirectory(uint8_t, const char*, const char*, char*)':
ultralcd_implementation_hitachi_HD44780.h:807: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'void lcd_implementation_update_indicators()':
ultralcd_implementation_hitachi_HD44780.h:877: error: 'lcd' was not declared in this scope
/ultralcd_implementation_hitachi_HD44780.h: In function 'uint8_t lcd_implementation_read_slow_buttons()':
ultralcd_implementation_hitachi_HD44780.h:893: error: 'lcd' was not declared in this scope
ultralcd_implementation_hitachi_HD44780.h:895: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd_implementation_hitachi_HD44780.h:895: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_status_screen()':
ultralcd.cpp:246: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:246: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_main_menu()':
ultralcd.cpp:337: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:337: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_tune_menu()':
ultralcd.cpp:420: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:420: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_preheat_pla_menu()':
ultralcd.cpp:558: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:558: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_preheat_abs_menu()':
ultralcd.cpp:578: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:578: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_prepare_menu()':
ultralcd.cpp:608: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:608: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void _lcd_move(const char*, int, int, int)':
ultralcd.cpp:674: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:674: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_move_e()':
ultralcd.cpp:698: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:698: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_move_menu_axis()':
ultralcd.cpp:703: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:703: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_move_menu()':
ultralcd.cpp:733: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:733: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_menu()':
ultralcd.cpp:744: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:744: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_temperature_menu()':
ultralcd.cpp:773: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:773: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_temperature_preheat_pla_settings_menu()':
ultralcd.cpp:810: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:810: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_temperature_preheat_abs_settings_menu()':
ultralcd.cpp:827: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:827: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_motion_menu()':
ultralcd.cpp:844: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:844: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_control_volumetric_menu()':
ultralcd.cpp:880: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:880: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_sdcard_menu()':
ultralcd.cpp:955: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:955: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp:958: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:958: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_int3()':
ultralcd.cpp:1038: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1038: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_int3()':
ultralcd.cpp:1038: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1038: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float3()':
ultralcd.cpp:1039: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1039: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float3()':
ultralcd.cpp:1039: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1039: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float32()':
ultralcd.cpp:1040: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1040: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float32()':
ultralcd.cpp:1040: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1040: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float43()':
ultralcd.cpp:1041: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1041: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float43()':
ultralcd.cpp:1041: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1041: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float5()':
ultralcd.cpp:1042: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1042: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float5()':
ultralcd.cpp:1042: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1042: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float51()':
ultralcd.cpp:1043: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1043: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float51()':
ultralcd.cpp:1043: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1043: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_float52()':
ultralcd.cpp:1044: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1044: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_float52()':
ultralcd.cpp:1044: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1044: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_long5()':
ultralcd.cpp:1045: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1045: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void menu_edit_callback_long5()':
ultralcd.cpp:1045: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1045: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_update()':
ultralcd.cpp:1245: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1245: error: 'BUTTON_RIGHT' was not declared in this scope
ultralcd.cpp: In function 'void lcd_buzz(long int, uint16_t)':
ultralcd.cpp:1441: error: 'lcd' was not declared in this scope
ultralcd.cpp: In function 'bool lcd_clicked()':
ultralcd.cpp:1447: error: 'BUTTON_SELECT' was not declared in this scope
ultralcd.cpp:1447: error: 'BUTTON_RIGHT' was not declared in this scope

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

Try installing this library: https://github.com/lincomatic/LiquidTWI2

Thank you for the reply, going to shoot you a PM with a quick question.