As we already know that Windows 10 will make its debut with Microsoft Lumia 950, Microsoft Lumia 950 XL, and Lumia 550, when the devices will be available for purchase this month or next. Also many people with old Lumia-branded handset now running on Windows Phone 8.1 are expecting the update.Today we got a little hint that

Here comes the Windows 10 Update Schedule for older Lumias

updates for older devices will commence from sometime in December, but now is revealed the actual time line on when it will come and for which device. The Orange Poland leaked the info regarding the schedule of the update.

On December 14, the first wave will start hitting the Lumia 630, 635, 640, 735, and 830. The second wave according to the sources will be much late around February 1^st, 2016 for the devices namely Lumia 520, 532, 625, 720, 820, 920, 925, 930, 1020, and 1320.

Interestingly Lumia 1520 is not mentioned anywhere because this model is only sold in Poland unlocked. The timeline appears real but only for Orange Poland, for others, it is expected that they would announce or roll out the update in the same time frame.