How to Connect Bluetooth Receipt Printer

Hi I use Loyverse POS with two Bluetooth printers A6, one is a normal generic mtp2 printer, and one is peripage printer. Last week all ok but now I can print with peripage through loyverse. If I use peripage app I can print what I want but I can print in loyverse app. I tried unistalling app, unpair print, but not success.

Someone can help me? 

So i just bought my Xprinter XP-58IIH recently. Although i read some topics here that Loyvese is not supporting this printer however this works perfectly with some of the videos that i watched. 
Whenever I am choosing Other Model in the Printer model option it always includes (Ethernet) and i don't have any other option to choose like USB or Bluetooth. I am using iPhone 11 Pro Max with iOS 14.2.
Meanwhile with my husbands mobile which is an Android phone if we choose Other Model in the printer, the interface has the option for Ethernet, Bluetooth & USB. 
So, i am thinking that this isn't the issue between the Xprinter that i have and loyverse, but its loyverse and iOS devices. 
 
*Note: I tried using the same iphone and xprinter with Xlabel the bluetooth device is connecting and is working properly. I hope this issue with ios user will be fix soon.
 
Hope you could help me in this problem. I attached some photos for your reference as well. 

Is my SM-T300i mobile bluetooth printer compatible with Loyverse on my IOS device?

Ref: connecting a mobile bluetooth printer in the Loyverse app.
In the Android version of the Loyverse app one can select an "Other" printer and "Bluetooth" connection. The printer works connected to Android devices. I need this functionality to be operational in the IOS version of the Loyverse app. In the IOS app (v10 user) we are not getting similar and flexible printer options for an Other/Bluetooth printer in the Loyverse app. The printer connects to the v10 IOS device and prints. But, the Loyverse app will not connect to the printer. Am I missing something and not seeing the Other/Printer options for IOS?

Hi,
 
I've been looking at the bluetooth thermal printers on amazon.com
A few of them say they don't support Android 7.0.
 
Has anyone tried to get any of the inexpensive, portable, bluetooth printers working with the software?
Thanks.