and by the way are you selling to customers like us ? or only to business ?

ok, my knowledge seems to be much better, and I also understand your motivation to replace Orange ONU with own device.

2 important elements:
- most of people need just 1x1G ONT, that will help them to connect own router/home infrastructure, but in "a simple way"***
- some more geeky geeks need 1x2.5G ONT that will utilize 2000/600 service

In general, to make it a "black box", so user don't have to think about vlan id, pbit (cos) for DHCP or dhcp options, that requires:
- modification of OMCI stack, to enforce untagging operation on LAN port. Normally OLT (central device) sends information about VLAN ID on user port, that needs to be overwritten with "remove tag" operation.
- adding so called "trap to CPU" of DHCP request, to:
-- drop it later on towards operator network with proper Pbit (6)
-- add DHCP option parameters "on the fly"

all above is doable, but some of these options violate OMCI protocol, and I never needed options as above, as it is not necessary to cheat on this level if you control entire network

For the moment, product that is available is LXT-010G-D (1x1G). Without modifications in code you can set lot of paramters you need to authorize device with Orange network.
And we can later on work on a code, that can be reused with 2.5G model (same main chipset) once it is available.

There is one unknown element for me - once you replace FunBox 5 that has built in GPON port - does it require different config than you replace older solution with separate ONT ?

About B2C sales, I need to check. B2B is available (VAT invoice, inter EU).

- TX-6610: end of life model, firmware bug limits to 700/550, but lots of options for parameters and settings.

Bizarre, il est sensé délivrer 2.5Gbps : https://www.tp-link.com/fr/home-networking/pon-sfu-hgu/tx-6610/

well, I like this forum, I can practice my poor french, at least reading

You can buy LXT-010G-D from xBest, but I'am not sure if also B2B only is supported.
Then - with firmware - need to write to me, as I do all builds and code corrections.

Not all parameters are possible to be modified via webGui, some need CLI commands, I will help.

Refering to 3 ONTs mentioned:
- you can set all parameters, it is flexible - but for now, mostly CLI
- max speed on TCP level was about 942Mbit/s - iperf test.. So it is max (bit more when you add all headers)

Well... seems everybody is moving on 2.5 Gbps ONU

A subscriber on my network is stressing a little bit the whole GPON port

It will happen, but in very short bursts. For other services as voip and iptv need to use proper QoS configuration, and all will work fine.
If GPON port will be overloaded - you can do 1:32 split.
It is still cheaper than migration towards XGSPON that will be (in my opinion) obsolete technology in few years, while GPON will still be in use

Let's say we order LXT-010G-D for testing, if we come accross this IPv6 / Orange FR bug as well, would you be able to dig into firmware (as you have SDK access) to see if it can be fixed ?

Ok, we can try.

In general IPv6 works on LXT-010G-D at least with Nokia ISAM7360 (former Alcatel-Lucent) OLT. Quite popular, widely used by Orange as well as Huawei OLT.

And it is very rarely in fact fixing bugs, it is fixing issues related to non-standard provisioning from OLT side. The problem is, that each vendor does some little things in a different way - often violating standards - and this is where we specialize - adjusting ONTs to specific OLT requirements.

Your case is even more specific, but first - we can check what can be done in case of my "default" firmware.
"default" here means, that there is lot of modifications/patches applied to OMCI and IGMP + some little cosmetic changes in remaining part of SDK.