NEWBI GUIDE TO INSTALL REMIX OS 2 ON CUBE IWORK 10

[Luís Santos]

JSYK, I used Dmitriy’s method to install Remix OS.
Installation would go into boot loop when TWRP was being overwritten by stock recovery, so I had to go into recovery (several times until it worked) and wipe everything, format “data” and do a factory reset.

In addition I had to mount “system” while on TWRP and rename “/system/recovery-from-boot.p” to “/system/recovery-from-boot.bak” and “/system/etc/install-recovery.sh” to “/system/etc/install-recovery.bak”.

Only after that did Remix proceeded to start.

But it was only using 8GB and the remaining storage was unallocated and unusable. I created a USB stick with Gparted Live and resized the “data” partition:

1. Move the “android_config” partition into the unallocated space, making sure you move it to the very end (e.g., to the far right) of the drive.

2. There’s a partition called “android_persistent” which cannot be moved. Don’t worry, create a new one in the unallocated space exactly the same as the original one (label, size and the file type as the black square (unknown, cleared, whatever your partitioning tools says)). Make sure you create it at the very end of the unallocated space, right before “android_config”. Don’t worry if the file system doesn’t read “unknown”, it will after you apply changes.

3. Now the unallocated space is right next to “data”, so just click on “data” and resize it so as to use up all the unallocated space.

4. Delete the original “android_persistent”.

5. Apply changes.

6. If needed, fine tune the “android_persistent” (the name/label might be lost after applying changes). Make it the same as before and reapply.

Reboot and you’re good to go with 64GB of Remix OS.

[Eduardo]

Hi,

I am tired of constant android reboot and power consumption when the tablet is not being used so I think installing another android might be worth it. Could you please aware me of the present drwabacks of doing so? Is there anything that is not going to work well?

 

Thanks

[Gray]

I’m not sure I understand the question …
Could you rephrase the question?

[Eduardo]

So the question is if remix is 100% operative in iwork10 or there are big bugs using it. If it is operative I would like to know best way to install it.

 

Thanks

[Gray]

 

Hi Eduardo,

RemixOS fully working system.
But as in any alternative ROM possible minor bugs.
Installation is quite standard and simple:
1. Download the zip file.
2. Install it through TWRP recovery
Good luck.

[Martin Gorbush]

Can someone check what maximum charging voltage for battery is used by this firmware. You can check this with CPU-Z or Battery Monitor applications after you charged tablet battery to 100%.

Factory Android kernel use CV charging like 4.35V which is definetely too much for built-in battery. I search for firmware with much lower value. Preferably 4.1V.

Thanks in advance ;).

[Gray]

Hi, Martin.
I did a series of tests (monitoring with BatteryWidget app), to test our battery.
When you reach 100% of charge, voltage stabilized at about ~4.253V.
It is normal for our kind of batteries.

You are a little mistaken about the built-in battery.
Depending on the specific technology, the battery can be: 3.6V; 3.7V; 3.8V.
Accordingly, the maximum charge voltage is: ~4.1V; ~4.2V; ~4.3V.
Our battery – 3.7V so ~ 4.2V maximum charge.
BR
Gray.

[Martin Gorbush]

Dear Gray.
I’m quite aware that there is many types of lithium ion batteries. Regardless. What I know mostly from batteryuniversity.com site as a rule of thumb you can say that every increase for 0.1V of maximum voltage for li-ion battery reduces available charge cycles by almost half and only increase holded charge by about 15%. For me calculation is simple. I’ve got many power source (car battery, power bank) and I don’t need to charge too much (topped under the cork).

This 4.25V is under this REMIX OS?

[Gray]

Dear Martin,

1. batteryuniversity.com, under management of the doctor (or already professor?) Buchmann , excellent knowledge source 🙂
Let me give you an example of settings of the (dr. Buchmann) device Cadex:
For 3.6V battery; Maximum charge voltage – 4.35V; standby voltage – 4.15V.

Accordingly, for our batteries cell with 3.7V rates are even higher;-)

2. Basic test I did at the stock ROM, and checked back on others.
Changes in charge parameters have not noticed.

Control of “Over Voltage Protection” (IMHO) depends more on the Power Manager IC.

BR,
Gray.

[Martin Gorbush]

Gray wrote:

Let me give you an example of settings of the (dr. Buchmann) device Cadex: For 3.6V battery; Maximum charge voltage – 4.35V; standby voltage – 4.15V. Accordingly, for our batteries cell with 3.7V rates are even higher

Yes, that is quite right. Therefore for 3.7V nominal voltage li-ion battery standby voltage should be 4.25V not 4.35V.
Besides everything. What I wrote about increasing maximum voltage should be true for almost every nominal voltage. When you charge 3.6V li-ion battery to 4.15V it will last for twice more charging cycles than when you charge it to 4.25V.

Gray wrote:

2. Basic test I did at the stock ROM, and checked back on others. Changes in charge parameters have not noticed. Control of “Over Voltage Protection” (IMHO) depends more on the Power Manager IC. BR, Gray.

I’ve got quite extensive knowledge about this tablet PMIC. I even found linux’s kernel source code for PMIC AXP20x which should be similar to Android’s kernel. One thing that catched my eye was that CV mode in absence of ACPI configuration is 4.35V. Therefore PMIC is trying to reach that voltage but it fails to do so when charging current gets below 20% (~370mA) of its programmed value (mostly 1800mA). That might happend in quite different voltage level depending on particular battery. Maximum which I saw myself was ~4.32V. Then when voltage drops below 4.25V (0.1 below CV mode setting) charging process starts again. It is very annoying and rather devastating for li-ion battery. At least I think so.

All of this can be verified by looking for “Dolar Cove” kernel parameters. I will edit this post when I recall correct path. I forgot to do that in another thread: http://techtablets.com/forum/topic/very-slow-battery-charging/#post-48327

Edit: I found Dollar Cove (PMIC AXP288x) configuration path: /sys/class/power_supply/dollar_cove_charger. There is parameter called “max_charge_voltage” which in my device is set to 4350mV and max_charge_current is 1800mA.

[Gray]

Hi,
I now see that you fully understand the topic.
But then I’m not sure I understand your first question:

Martin Gorbush wrote:

Factory Android kernel use CV charging like 4.35V which is definetely to much for built-in battery.

For 3.7V battery maximum CV charging voltage 4.35V is not “to much”, I would say a little, for your explanation of the some like +/- 4.45V….

[Martin Gorbush]

Gray wrote:

Martin Gorbush wrote:

Factory Android kernel use CV charging like 4.35V which is definetely too much for built-in battery.

For 3.7V battery maximum CV charging voltage 4.35V is not “too much”, I would say a little, for your explanation of the some like +/- 4.45V….

“Too much” is a vague statement. Sorry for that. I will refine it. When I want to have 8000mAh li-ion battery I can get 7000mAh at 4.2V cell and charge it to 4.3V. Doing so will increase charge capacity by about 15% but not without consequences. And yes it will probably not explode but I will reduce usable charging cycles by about half. For me this is “too much” as a trade off.
There is one more thing but I’m not completely sure if I got it right. Battery in my unit doesn’t reach 4.35V in Android because charging process is terminated probably abruptly (at 20% of maximum current) but it shouldn’t happen outside of Constant Voltage Charging mode. Even so when battery voltage drops to 4.25V topping charging is activated. When I don’t disconnect tablet from power source it happen quite often (few times an hour).

[Alessio]

Hi, I too would like to install Remix OS on my Cube iWork 10 Ultimate (Windows 10 + Android Lollipop + Type-C). How do I proceed? Thank you all in advance.

[brainvision]

@Alessio, you’ll find instructions on previous pages, specifically page 5 by Dimitry, or you could find instructions by the author of the thread on the first page; easy..

 

<hr />

 

GUYS I have a different question.. I read in first post that touch “works but stops all the time”; what does it means exactly? I have no original Cube keyboard so it is important to me that the touch works all the time.. does it?

thanks a lot! see you

[Gray]

brainvision wrote:

that the touch works all the time.

Hi @alessio
Not really, sometimes it’s stuck without any known reason.
I test this in different ROM’s, with some result.
BR

[Author]

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