diff --git a/IDE_Board_Manager/package_prusa3d_index.json b/IDE_Board_Manager/package_prusa3d_index.json
index fc31889..685d464 100644
--- a/IDE_Board_Manager/package_prusa3d_index.json
+++ b/IDE_Board_Manager/package_prusa3d_index.json
@@ -10,6 +10,28 @@
       },
       "platforms": [
         {
+            "name": "Prusa Research AVR Boards",
+            "architecture": "avr",
+            "version": "1.0.4",
+            "category": "Contributed",
+            "url": "https://raw.githubusercontent.com/prusa3d/Arduino_Boards/master/IDE_Board_Manager/prusa3dboards-1.0.4.tar.bz2",
+            "archiveFileName": "prusa3dboards-1.0.4.tar.bz2",
+            "checksum": "SHA-256:56afa164c6c7a8e09d0d1c739ea98a432e1adbe5744877779f8b5fc38c42df52",
+            "size": "103531",
+            "help": {
+              "online": "https://github.com/prusa3d/Arduino_Boards/blob/master/IDE_Board_Manager/prusa3dboards-1.0.4.md"
+            },
+            "boards": [
+              {
+                "name": "Original Prusa i3 MK3 Multi Material 2.0 upgrade"
+              },
+              {
+                "name": "Original Prusa i3 MK3/MK3S Einsy RAMBo"
+              }
+            ],
+            "toolsDependencies": []
+          },
+          {
           "name": "Prusa Research AVR Boards",
           "architecture": "avr",
           "version": "1.0.3",
diff --git a/IDE_Board_Manager/prusa3dboards-1.0.4.md b/IDE_Board_Manager/prusa3dboards-1.0.4.md
new file mode 100644
index 0000000..eb55f8a
--- /dev/null
+++ b/IDE_Board_Manager/prusa3dboards-1.0.4.md
@@ -0,0 +1,132 @@
+# Prusa Research Boards definition version 1.0.4
+
+## Boards supported
+- [Prusa MM control board](https://github.com/prusa3d/MM-control-2.0) using prusa3dboards-1.0.2.tar.bz2
+  - including bootloader
+- Einsy/miniRAMBo boards using prusa3dboards-1.0.4.tar.bz2
+  - including bootloader
+  - [Einsys](https://reprap.org/wiki/EinsyRambo)
+  - [miniRAMbo](https://reprap.org/wiki/MiniRambo)
+## Specials/Limits
+- Restricted cores version for the Einsy/miniRAMBo boards
+
+## Changes to previous version
+- [Rework compiler flags](https://github.com/prusa3d/Arduino_Boards/pull/10)
+- [Save a bit more ram by not compiling millis at all](https://github.com/prusa3d/Arduino_Boards/pull/12)
+- [Add linker script](https://github.com/prusa3d/Arduino_Boards/pull/11)
+- [Make builds more reproducible through -frandom-seed](https://github.com/prusa3d/Arduino_Boards/pull/8)
+
+Folder Structure:
+```
+.
+└── IDE_Board_Manager
+    └── prusa3dboards
+        ├── bootloaders
+        │   ├── prusa_einsy_rambo
+        │   └── prusa_mm_control
+        ├── cores
+        │   └── prusa_einsy_rambo
+        ├── ldscripts
+        └── variants
+            ├── prusa_einsy_rambo
+            └── prusa_mm_control
+```
+File Structure:
+```
+.
+├── IDE_Board_Manager
+│   ├── package_prusa3d_index.json
+│   ├── Prepare-new-version.sh
+│   ├── prusa3dboards
+│   │   ├── avrdude.conf
+│   │   ├── avrdude.md
+│   │   ├── boards.txt
+│   │   ├── bootloaders
+│   │   │   ├── prusa_einsy_rambo
+│   │   │   │   ├── avr_cpunames.h
+│   │   │   │   ├── avrinterruptnames.h
+│   │   │   │   ├── command.h
+│   │   │   │   ├── lcd.c
+│   │   │   │   ├── lcd.h
+│   │   │   │   ├── License.txt
+│   │   │   │   ├── Makefile
+│   │   │   │   ├── settings.h
+│   │   │   │   ├── stk500boot.c
+│   │   │   │   ├── stk500boot.h
+│   │   │   │   ├── stk500boot.hex
+│   │   │   │   └── stk500boot_v2_mega2560.hex
+│   │   │   └── prusa_mm_control
+│   │   │       ├── build.txt
+│   │   │       ├── Caterina-prusa_mm_control.hex
+│   │   │       ├── program.txt
+│   │   │       └── Readme.txt
+│   │   ├── cores
+│   │   │   └── prusa_einsy_rambo
+│   │   │       ├── abi.cpp
+│   │   │       ├── Arduino.h
+│   │   │       ├── binary.h
+│   │   │       ├── CDC.cpp
+│   │   │       ├── Client.h
+│   │   │       ├── HardwareSerial0.cpp
+│   │   │       ├── HardwareSerial1.cpp
+│   │   │       ├── HardwareSerial2.cpp
+│   │   │       ├── HardwareSerial3.cpp
+│   │   │       ├── HardwareSerial.cpp
+│   │   │       ├── HardwareSerial.h
+│   │   │       ├── HardwareSerial_private.h
+│   │   │       ├── hooks.c
+│   │   │       ├── IPAddress.cpp
+│   │   │       ├── IPAddress.h
+│   │   │       ├── main.cpp
+│   │   │       ├── new.cpp
+│   │   │       ├── new.h
+│   │   │       ├── PluggableUSB.cpp
+│   │   │       ├── PluggableUSB.h
+│   │   │       ├── Printable.h
+│   │   │       ├── Print.cpp
+│   │   │       ├── Print.h
+│   │   │       ├── Server.h
+│   │   │       ├── Stream.cpp
+│   │   │       ├── Stream.h
+│   │   │       ├── Tone.cpp
+│   │   │       ├── Udp.h
+│   │   │       ├── USBAPI.h
+│   │   │       ├── USBCore.cpp
+│   │   │       ├── USBCore.h
+│   │   │       ├── USBDesc.h
+│   │   │       ├── WCharacter.h
+│   │   │       ├── WInterrupts.c
+│   │   │       ├── wiring_analog.c
+│   │   │       ├── wiring.c
+│   │   │       ├── wiring_digital.c
+│   │   │       ├── wiring_private.h
+│   │   │       ├── wiring_pulse.c
+│   │   │       ├── wiring_pulse.S
+│   │   │       ├── wiring_shift.c
+│   │   │       ├── WMath.cpp
+│   │   │       ├── WString.cpp
+│   │   │       └── WString.h
+│   │   ├── ldscripts
+│   │   │   └── avr6.xn
+│   │   ├── platform.txt
+│   │   └── variants
+│   │       ├── prusa_einsy_rambo
+│   │       │   └── pins_arduino.h
+│   │       └── prusa_mm_control
+│   │           └── pins_arduino.h
+│   ├── prusa3dboards-1.0.0.md
+│   ├── prusa3dboards-1.0.0.tar.bz2
+│   ├── prusa3dboards-1.0.1.md
+│   ├── prusa3dboards-1.0.1.tar.bz2
+│   ├── prusa3dboards-1.0.2.md
+│   ├── prusa3dboards-1.0.2.tar.bz2
+│   ├── prusa3dboards-1.0.3.md
+│   ├── prusa3dboards-1.0.3.tar.bz2
+│   ├── prusa3dboards-1.0.4.md
+│   ├── prusa3dboards-1.0.4.tar.bz2
+│   ├── prusa3dboards.version
+│   ├── prusa3drambo-1.0.0.tar.bz2
+│   └── prusa3drambo-1.0.1.tar.bz2
+├── LICENSE
+└── README.md
+```
diff --git a/IDE_Board_Manager/prusa3dboards-1.0.4.tar.bz2 b/IDE_Board_Manager/prusa3dboards-1.0.4.tar.bz2
new file mode 100644
index 0000000..4dd449b
Binary files /dev/null and b/IDE_Board_Manager/prusa3dboards-1.0.4.tar.bz2 differ
diff --git a/IDE_Board_Manager/prusa3dboards.version b/IDE_Board_Manager/prusa3dboards.version
index 222aba4..90917ee 100644
--- a/IDE_Board_Manager/prusa3dboards.version
+++ b/IDE_Board_Manager/prusa3dboards.version
@@ -1,3 +1,4 @@
+1.0.4   # Rework compiler flags, linker script, Make builds more reproducible, not compiling millis by @wavexx and @leptun
 1.0.3   # Fix "timer0_fract = 0;" warning
 1.0.2   # With bootloader and compiler.c.elf.extra_flags for Prusa Einsy/RAMBo Prusa Frimware
 1.0.1   # Added Einsy/miniRAMBo boards