Root and/or flash ROM on Haier Haipad 8.0 (PAD821) I'm trying to root my haipad but none of the methods I found over the internet works.
Here the PAD821 features:

Basic parameters

Time to market: February 2013
Product positioning: Entertainment Tablet PC
Operating system: Android4.1
CPU/GPU Processor architecture: ARM architecture
Processor model: ARM Cortex-A9
Processor Main Frequency: 1.5GHz
Processors core: Dual core

Storage device
System memory: 1GB
Storage capacity: 8GB
Storage media: Flash Flash disk
Storage expansion: supports Micro SD (TF) card, maximum support 32GB

Display
Screen size: 8 inches
Screen resolution: 1024x768
Screen description: Capacitive touch screen, Multi-point touch screen
Pointing device: touch screen
Screen characteristics: Five-point touch screen,The TFT screen,LED backlight
Language support: supports many languages
Network connection: WiFi support
Network mode: 3G module reserved ports
Bluetooth: Bluetooth 4

Multimedia features
Sound system: Double stereo speakers,Built-in microphone
Video playback: support playback of 720P vide
Camera: dual camera (front: 300,000 pixels, rear: 2 million pixels)
Video recording: support for recording 720P video
Flash features: supports Flash

Format support
Audio format: supports MP3 format
Video formats: supports MP4 format
Picture formats: support JPEG,BMP,GIF,format
Text formatting: supports TXT format
Buttons/interfaces: Data interface Micro-USB
Audio interface: 3.5mm earphone interface
Other interface: power interface,memory card interface
Function keys: switch button, volume buttons

Power parameter
Battery type: Lithium battery,4400mAh
Life time: depending on the using environment, at a specific time
Power adapter: DC (5V, 2A) adaptive AC power supply
Function parameters: Built-in induction The intelligent gravity sensor
Basic applications: Baidu input method,The ES file browser,PPTV,AppChina,WPS

Appearance parameters
Product size: 204.37x155.42x9.5mm
weight: 432g 
Casing material: composite materials
Casing color: silver


Is there someone who knows a ROM compatible with such a device? Otherwise: is there a way to root it? Which version of the recovery (CWM or TWRP) can I install?
Thanks in advance.
First, have you tried to search for this device on http://forum.xda-developers.com? They should have got the ROM and the ROOTing method for you. 

Note: Never try to ROOT or install a ROM from someone you don't trust! Again never root the device when its still in use, because Rooting the device would remove the warranty of its! You might brick your device too. 

You can try to search for the ROM by the name. Secondly I know the good rooting software, search for Bin4ry root! They will root you device, you can follow steps! hehehe, you must see the Note I provided before continuing the process.

By that software, you can first Root the device. Then check for the CWM support for your device on their site. Or you can Google it to find the best solution for that phone. After installing the CWM, you can easily install a ROM, but again, becarefull while installing the ROM, you might brick the phone.

Good luck, Cheers!