@Sunshine 

My current Firmware Version is :

1.6.0 0.9.1 v0001.0 Build 220105 Rel.58321n

It is now showing 4G+

Its currently on bands 3,40

When the router was on 1.7.0 then 4G+ indicator kept blinking in 2 seconds interval.

  @SweenWolf 

Hi everyone,
I also have the same problem with the new firmware....unfortunately I can't reset the modem, I was wondering if it was possible to downgrade the firmware to the previous version without resetting the modem:
I downloaded the old firmware 1.6.0 from the official tp-link site if I try to install it, does it succeed or does it freeze because it understands that it is older than the one currently installed?

  @Feda1980 

If your device can be downgraded then it will be downgraded, otherwise the device will just give you an error (In my case, i can downgrade to 1.6.0 but not to 1.5.0).

You will lose your settings if you downgrade. In most cases downgrading is allowed, only exception is if the update contains some CVE patches then downgrading isn't allowed.

  @SweenWolf 

yeah i have the same problem in new 1.7.0 0.9.1 firmware update in mr600 v2 

4G+ LED light on router blinking many time when start using internet or surfing the web but when i want to download a file it was stable and don't seems to blink

the problem begins when i update my router firmware automatically in the router panel from firmware upgrade page

now my question is this can be dangerous for my router or cause damage?and may i need to downgrade to previous version?

please help.

  @mmd3532 

Blinking 4G+ means band are not locking.

The router is continuously switching between 4G and 4G+.

Downgrading will not cause any issue.

But make sure there's no power cut during downgrade. I have a ups attached to the router so i had no problem with it.

  @SweenWolf 

Hi everyone,
in the end I downgraded to the previous firmware ... by downgrading, however, the router returned to the initial settings, luckily having made a backup I was able to restore the settings as I wanted.
The question now is:
When will TP-LINK issue a new firmware that will fix this problem on firmware 1.7??
I did the downgrade to recover the 4G+ but I have the problem of the previous firmware, i.e. that from the App Tether even if the router is actually connected to the internet from the app it is inaccessible...
Remove a problem and find another ... when a firmware finally done well and not with the feet???

  @Sunshine 

Hi, I would love to help out.

My phone is Samsung Galaxy A73 5G (SM-A736B/DS), it shows 4G+ most of the time, i lose 4g+ when raining heavily, otherwise its consistent 4g+.

The router also always has 4G+ when its on 1.6.0 (i have manually selected band), the issue only arises when i upgrade it to 1.7.0