ONYX BOOX Caesar 4 eReader :: ONYX BOOX electronic books

ONYX BOOX Caesar 4 is a device for reading electronic books with an "electronic paper" E Ink Carta Plus screen and the built-in MOON light 2 system with color temperature control and the SNOW Field function. This model is designed for those users who are planning to use it for reading and who don't need a variety of additional functions. Thanks to the 4-core processor and 512 MB of RAM this eReader has higher performance. The smoothly adjustable Moon Light 2 frontlight system makes reading comfortable even in low light conditions, and a built-in microSD card slot and 8 GB of flash memory allow you to carry an entire library with you.

What is E Ink Carta Plus

E Ink Carta Plus is the latest generation of screens made on the "electronic paper" technology. Compared to previous models, this screen has higher definition and contrast. Pixel density of the screen is 300 dpi that is a record for this type of E Ink screens and corresponds to high-quality paper printing. Reading on such screens is as comfortable as from the page of a good paper book.

What is SNOW Field

SNOW Field is an operating mode of the screen, allowing to reduce the number of artifacts on the screen within partial refresh. If this function is on, full refresh of the screen is not needed.

Screen frontlight

The MOON Light 2 technology enables one to use the device in the dark or under poor lighting conditions. When this function is in use, soft luminescence of the screen comfortable for reading in dark rooms is being generated. It also has a color temperature control and, thanks to the use of Flicker-Free technology, the front-light system is perfectly smooth.

What is MOON Light 2

The latest researches have shown that blue light prevents the production of melatonin (daily rhythms regulator), which is necessary for a person to sleep. Therefore, after reading on a glowing screen of an ordinary tablet or smartphone, it is often difficult to fall asleep. MOON Light 2 allows you to adjust the brightness of cold and warm LED lights independently, choosing at will white light for reading during the daytime, and more yellow for reading before sleeping. The Flicker-Free technology completely eliminates shimmering of the LEDs used in this screen frontlight system. This is due to the use of a DC power supply.The Flicker-Free technology significantly reduces discomfort for sight and eye fatigue and decreases the chances of headache, caused by long use of the eReader.

High performance

A quad-core processor with 1,2 GHz clock rate and 512 MB of RAM ensures comfortable work with difficult documents. And 8 GB of nonvolatile memory and a microSD-slot supporting memory cards up to 32 GB allows the user to store a whole library.

Format support

The BOOX software allows the user to open files of various text and graphic formats. When reading you can change font style and size, disposition of pages, insert bookmarks, add your own fonts and zoom documents at will.

Built-in dictionaries

There are pre-installed English-Russian and Russian-English dictionaries in ONYX BOOX Caesar 4. To translate an unknown word just choose it in the text.

Possibility of reprogramming

Caesar 4 allows the user to write personal software using the potentials of the Android 4.4 platform.

Long-lasting work

Low power consumption of the E-Ink display and battery capacity of 3000 mAh provides long-lasting autonomous work.

Language support

The BOOX allows the user to read documents in different world languages. Amongst them there are such languages as Russian, English, German, French, Spanish, Arabic, Swedish, Chinese, Japanese and many others.

Display	6", E Ink Carta Plus, 16 shades of grey, 1072 × 1448 pixels, pixel density 300 ppi with the SNOW Field function
Processor	4-core, 1,2 GHz
Front light	MOON Light 2
RAM	512 MB
Internal memory	8 GB
Expansion slot	For micro SD/microSDHC cards
USB interface	micro-USB
Supported file formats	Text: TXT, HTML, RTF, FB2, FB2.zip, MOBI, CHM, PDB, DOC, DOCX, PRC, EPUB, PDF, DjVu Graphic: JPG, PNG, GIF, BMP Others: CBR, CBZ
Battery	Li-on 3000 mAh
Operating system	Android 4.4
Size	170 × 117 × 8,7 mm
Color	Black
Weight	182 gr
Kit	ONYX BOOX Caesar 4 eReader User's manual USB cable Warranty card
Warranty period	1 year

Note: Since a part of the Flash memory size is system software, the portion available to the user is less than the total size of the memory chip.

The device is designed primarily for reading electronic books, but has some additional features which are defined by the installed software.
The device is freely reprogrammable on request of the user who can install, delete and create programs.
The device has a battery that provides long, autonomous usage.

Current firmware version Nov 18, 2020

Version: 2020-11-18_13-18_2.1.2_a530a02
MD5 checking sum: 769cb405d23fc9ca1fdd811520728463
Download: firmware update file (295.693 MB, ZIP-file)

Setup

Download the firmware update.zip file onto your PC.
Charge the device battery at least up to 50%.
Extract the content from the downloaded update.zip file. You will have the update.upx file.
Connect your ereader to your PC.
Copy this update.upx file into your device into the root directory of the internal memory via a USB cable.
From the main page of the eReader go to Settings > About > System Update > Check update from local storage.
There will be the question: "New update package found. Do you want to update?". Choose "OK".
Updating process will start. It will last for about 5 minutes.
If there appears the system menu in the process, select Reboot Now with the help of the side buttons and confirm your choice with a short press of the Power button.
Wait till the user interface starts.
Having installed the firmware, you need to calibrate the battery. The calibration procedure cannot be interrupted by resetting the device to default settings. The procedure consists of three steps:
- Charge the device to 100 percent after updating without disconnecting it from a power source until the level reaches 100 percent.
- When the battery reaches, use the device in normal mode until the battery discharges completely (the icon with a cable appears on the screen demanding to charge the device).
- Then charge again the device uninterruptedly to 100 percent. The battery calibration has been performed.